Adding needed getter for diagnostic manager. Useful
[apps/agl-service-can-low-level.git] / src / can / can-bus-dev.cpp
1 /*
2 * Copyright (C) 2015, 2016, 2017 "IoT.bzh"
3 * Author "Romain Forlot" <romain.forlot@iot.bzh>
4 * Author "Loïc Collignon" <loic.collignon@iot.bzh>
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *       http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19
20 #include <unistd.h>
21 #include <string.h>
22 #include <net/if.h>
23 #include <sys/ioctl.h>
24 #include <linux/can/raw.h>
25
26 #include <mutex>
27
28 #include "can-bus-dev.hpp"
29
30 #include "can-bus.hpp"
31 #include "can-message.hpp"
32 #include "../low-can-binding.hpp"
33
34 /// @brief Class constructor
35 /// @param dev_name String representing the device name into the linux /dev tree
36 can_bus_dev_t::can_bus_dev_t(const std::string& dev_name)
37         : device_name_{dev_name}
38 {
39 }
40
41 std::string can_bus_dev_t::get_device_name() const
42 {
43         return device_name_;
44 }
45
46 /// @brief Open the can socket and returning it
47 /// @return -1 if something wrong.
48 int can_bus_dev_t::open()
49 {
50         const int canfd_on = 1;
51         const int timestamp_on = 1;
52         struct ifreq ifr;
53         struct timeval timeout;
54
55         DEBUG(binder_interface, "CAN Handler socket : %d", can_socket_.socket());
56         if (can_socket_)
57                 return 0;
58
59         can_socket_.open(PF_CAN, SOCK_RAW, CAN_RAW);
60         if (can_socket_)
61         {
62                 DEBUG(binder_interface, "CAN Handler socket correctly initialized : %d", can_socket_.socket());
63
64                 // Set timeout for read
65                 can_socket_.setopt(SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
66
67                 // Set timestamp for receveid frame
68                 if (can_socket_.setopt(SOL_SOCKET, SO_TIMESTAMP, &timestamp_on, sizeof(timestamp_on)) < 0)
69                         WARNING(binder_interface, "setsockopt SO_TIMESTAMP error: %s", ::strerror(errno));
70                 DEBUG(binder_interface, "Switch CAN Handler socket to use fd mode");
71
72                 // try to switch the socket into CAN_FD mode
73                 if (can_socket_.setopt(SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on)) < 0)
74                 {
75                         NOTICE(binder_interface, "Can not switch into CAN Extended frame format.");
76                         is_fdmode_on_ = false;
77                 }
78                 else
79                 {
80                         DEBUG(binder_interface, "Correctly set up CAN socket to use FD frames.");
81                         is_fdmode_on_ = true;
82                 }
83
84                 // Attempts to open a socket to CAN bus
85                 ::strcpy(ifr.ifr_name, device_name_.c_str());
86                 DEBUG(binder_interface, "ifr_name is : %s", ifr.ifr_name);
87                 if(::ioctl(can_socket_.socket(), SIOCGIFINDEX, &ifr) < 0)
88                 {
89                         ERROR(binder_interface, "ioctl failed. Error was : %s", strerror(errno));
90                 }
91                 else
92                 {
93                         txAddress_.can_family = AF_CAN;
94                         txAddress_.can_ifindex = ifr.ifr_ifindex;
95
96                         // And bind it to txAddress
97                         DEBUG(binder_interface, "Bind the socket");
98                         if (can_socket_.bind((struct sockaddr *)&txAddress_, sizeof(txAddress_)) < 0)
99                                 ERROR(binder_interface, "Bind failed. %s", strerror(errno));
100                         else return 0;
101                 }
102                 close();
103         }
104         else ERROR(binder_interface, "socket could not be created. Error was : %s", ::strerror(errno));
105         return -1;
106 }
107
108 /// @brief Close the bus.
109 int can_bus_dev_t::close()
110 {
111         return can_socket_.close();
112 }
113
114 /// @brief Read the can socket and retrieve canfd_frame
115 can_message_t can_bus_dev_t::read()
116 {
117         ssize_t nbytes;
118         struct canfd_frame cfd;
119
120         // Test that socket is really opened
121         if (can_socket_)
122         {
123                 ERROR(binder_interface, "read_can: Socket unavailable. Closing thread.");
124                 is_running_ = false;
125         }
126
127         nbytes = ::read(can_socket_.socket(), &cfd, CANFD_MTU);
128
129         // if we did not fit into CAN sized messages then stop_reading.
130         if (nbytes != CANFD_MTU && nbytes != CAN_MTU)
131         {
132                 if (errno == ENETDOWN)
133                         ERROR(binder_interface, "read: %s CAN device down", device_name_.c_str());
134                 ERROR(binder_interface, "read: Incomplete CAN(FD) frame");
135                 ::memset(&cfd, 0, sizeof(cfd));
136         }
137
138         DEBUG(binder_interface, "read: Found id: %X, length: %X, data %02X%02X%02X%02X%02X%02X%02X%02X", cfd.can_id, cfd.len,
139                                                         cfd.data[0], cfd.data[1], cfd.data[2], cfd.data[3], cfd.data[4], cfd.data[5], cfd.data[6], cfd.data[7]);
140         return can_message_t::convert_from_canfd_frame(cfd, nbytes);
141 }
142
143 /// @brief start reading threads and set flag is_running_
144 /// @param[in] can_bus reference can_bus_t. it will be passed to the thread to allow using can_bus_t queue.
145 void can_bus_dev_t::start_reading(can_bus_t& can_bus)
146 {
147         DEBUG(binder_interface, "Launching reading thread");
148         is_running_ = true;
149         th_reading_ = std::thread(&can_bus_dev_t::can_reader, this, std::ref(can_bus));
150         if(!th_reading_.joinable())
151                 is_running_ = false;
152 }
153
154 /// @brief stop the reading thread setting flag is_running_ to false and and wait that the thread finish its job.
155 void can_bus_dev_t::stop_reading()
156 {
157         is_running_ = false;
158 }
159
160 /// @brief Thread function used to read the can socket.
161 /// @param[in] can_bus object to be used to read the can socket
162 void can_bus_dev_t::can_reader(can_bus_t& can_bus)
163 {
164         while(is_running_)
165         {
166                 can_message_t msg = read();
167                 {
168                         std::lock_guard<std::mutex> can_message_lock(can_bus.get_can_message_mutex());
169                         can_bus.push_new_can_message(msg);
170                 }
171                 can_bus.get_new_can_message_cv().notify_one();
172         }
173 }
174
175 /// @brief Send a can message from a can_message_t object.
176 /// @param[in] can_msg the can message object to send
177 int can_bus_dev_t::send(can_message_t& can_msg)
178 {
179         ssize_t nbytes;
180         canfd_frame f;
181
182         f = can_msg.convert_to_canfd_frame();
183
184         if(can_socket_.socket())
185         {
186                 nbytes = ::sendto(can_socket_.socket(), &f, sizeof(struct canfd_frame), 0,
187                         (struct sockaddr*)&txAddress_, sizeof(txAddress_));
188                 if (nbytes == -1)
189                 {
190                         ERROR(binder_interface, "send_can_message: Sending CAN frame failed.");
191                         return -1;
192                 }
193                 return (int)nbytes;
194         }
195         else
196         {
197                 ERROR(binder_interface, "send_can_message: socket not initialized. Attempt to reopen can device socket.");
198                 open();
199         }
200         return 0;
201 }
202
203 /// @brief Send a can message from a can_message_t object.
204 /// @param[in] can bus used to send the message
205 /// @param[in] can_msg the can message object to send
206 bool can_bus_dev_t::shims_send(const uint32_t arbitration_id, const uint8_t* data, const uint8_t size)
207 {
208         ssize_t nbytes;
209         canfd_frame f;
210
211         f.can_id = arbitration_id;
212         f.len = size;
213         ::memcpy(f.data, data, size);
214
215         if(can_socket_.socket())
216         {
217                 nbytes = ::sendto(can_socket_.socket(), &f, sizeof(struct canfd_frame), 0,
218                         (struct sockaddr*)&txAddress_, sizeof(txAddress_));
219                 if (nbytes == -1)
220                 {
221                         ERROR(binder_interface, "send_can_message: Sending CAN frame failed.");
222                         return -1;
223                 }
224                 return (int)nbytes;
225         }
226         else
227         {
228                 ERROR(binder_interface, "send_can_message: socket not initialized. Attempt to reopen can device socket.");
229                 open();
230         }
231         return 0;
232 }