Keep subscription to signal simplier without doubling
[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, int32_t address)
37         : device_name_{dev_name}, address_{address}
38 {}
39
40 std::string can_bus_dev_t::get_device_name() const
41 {
42         return device_name_;
43 }
44
45 /// @brief Open the can socket and returning it
46 /// @return -1 if something wrong.
47 int can_bus_dev_t::open()
48 {
49         const int canfd_on = 1;
50         const int timestamp_on = 1;
51         struct ifreq ifr;
52         struct timeval timeout;
53
54         DEBUG(binder_interface, "CAN Handler socket : %d", can_socket_.socket());
55         if (can_socket_)
56                 return 0;
57
58         can_socket_.open(PF_CAN, SOCK_RAW, CAN_RAW);
59         if (can_socket_)
60         {
61                 DEBUG(binder_interface, "CAN Handler socket correctly initialized : %d", can_socket_.socket());
62
63                 // Set timeout for read
64                 can_socket_.setopt(SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
65
66                 // Set timestamp for receveid frame
67                 if (can_socket_.setopt(SOL_SOCKET, SO_TIMESTAMP, &timestamp_on, sizeof(timestamp_on)) < 0)
68                         WARNING(binder_interface, "setsockopt SO_TIMESTAMP error: %s", ::strerror(errno));
69                 DEBUG(binder_interface, "Switch CAN Handler socket to use fd mode");
70
71                 // try to switch the socket into CAN_FD mode
72                 if (can_socket_.setopt(SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on)) < 0)
73                 {
74                         NOTICE(binder_interface, "Can not switch into CAN Extended frame format.");
75                         is_fdmode_on_ = false;
76                 }
77                 else
78                 {
79                         DEBUG(binder_interface, "Correctly set up CAN socket to use FD frames.");
80                         is_fdmode_on_ = true;
81                 }
82
83                 // Attempts to open a socket to CAN bus
84                 ::strcpy(ifr.ifr_name, device_name_.c_str());
85                 DEBUG(binder_interface, "ifr_name is : %s", ifr.ifr_name);
86                 if(::ioctl(can_socket_.socket(), SIOCGIFINDEX, &ifr) < 0)
87                 {
88                         ERROR(binder_interface, "ioctl failed. Error was : %s", strerror(errno));
89                 }
90                 else
91                 {
92                         txAddress_.can_family = AF_CAN;
93                         txAddress_.can_ifindex = ifr.ifr_ifindex;
94
95                         // And bind it to txAddress
96                         DEBUG(binder_interface, "Bind the socket");
97                         if (can_socket_.bind((struct sockaddr *)&txAddress_, sizeof(txAddress_)) < 0)
98                                 ERROR(binder_interface, "Bind failed. %s", strerror(errno));
99                         else return 0;
100                 }
101                 close();
102         }
103         else ERROR(binder_interface, "socket could not be created. Error was : %s", ::strerror(errno));
104         return -1;
105 }
106
107 /// @brief Close the bus.
108 int can_bus_dev_t::close()
109 {
110         return can_socket_.close();
111 }
112
113 /// @brief Read the can socket and retrieve canfd_frame
114 can_message_t can_bus_dev_t::read()
115 {
116         ssize_t nbytes;
117         struct canfd_frame cfd;
118
119         // Test that socket is really opened
120         if (can_socket_)
121         {
122                 ERROR(binder_interface, "read_can: Socket unavailable. Closing thread.");
123                 is_running_ = false;
124         }
125
126         nbytes = ::read(can_socket_.socket(), &cfd, CANFD_MTU);
127
128         // if we did not fit into CAN sized messages then stop_reading.
129         if (nbytes != CANFD_MTU && nbytes != CAN_MTU)
130         {
131                 if (errno == ENETDOWN)
132                         ERROR(binder_interface, "read: %s CAN device down", device_name_.c_str());
133                 ERROR(binder_interface, "read: Incomplete CAN(FD) frame");
134                 ::memset(&cfd, 0, sizeof(cfd));
135         }
136
137         DEBUG(binder_interface, "read: Found id: %X, length: %X, data %02X%02X%02X%02X%02X%02X%02X%02X", cfd.can_id, cfd.len,
138                                                         cfd.data[0], cfd.data[1], cfd.data[2], cfd.data[3], cfd.data[4], cfd.data[5], cfd.data[6], cfd.data[7]);
139         return can_message_t::convert_from_canfd_frame(cfd, nbytes);
140 }
141
142 /// @brief start reading threads and set flag is_running_
143 /// @param[in] can_bus reference can_bus_t. it will be passed to the thread to allow using can_bus_t queue.
144 void can_bus_dev_t::start_reading(can_bus_t& can_bus)
145 {
146         DEBUG(binder_interface, "Launching reading thread");
147         is_running_ = true;
148         th_reading_ = std::thread(&can_bus_dev_t::can_reader, this, std::ref(can_bus));
149         if(!th_reading_.joinable())
150                 is_running_ = false;
151 }
152
153 /// @brief stop the reading thread setting flag is_running_ to false and and wait that the thread finish its job.
154 void can_bus_dev_t::stop_reading()
155 {
156         is_running_ = false;
157 }
158
159 /// @brief Thread function used to read the can socket.
160 /// @param[in] can_bus object to be used to read the can socket
161 void can_bus_dev_t::can_reader(can_bus_t& can_bus)
162 {
163         while(is_running_)
164         {
165                 can_message_t msg = read();
166                 {
167                         std::lock_guard<std::mutex> can_message_lock(can_bus.get_can_message_mutex());
168                         can_bus.push_new_can_message(msg);
169                 }
170                 can_bus.get_new_can_message_cv().notify_one();
171         }
172 }
173
174 /// @brief Send a can message from a can_message_t object.
175 /// @param[in] can_msg the can message object to send
176 int can_bus_dev_t::send(can_message_t& can_msg)
177 {
178         ssize_t nbytes;
179         canfd_frame f;
180
181         f = can_msg.convert_to_canfd_frame();
182
183         if(can_socket_.socket())
184         {
185                 nbytes = ::sendto(can_socket_.socket(), &f, sizeof(struct canfd_frame), 0,
186                         (struct sockaddr*)&txAddress_, sizeof(txAddress_));
187                 if (nbytes == -1)
188                 {
189                         ERROR(binder_interface, "send_can_message: Sending CAN frame failed.");
190                         return -1;
191                 }
192                 return (int)nbytes;
193         }
194         else
195         {
196                 ERROR(binder_interface, "send_can_message: socket not initialized. Attempt to reopen can device socket.");
197                 open();
198         }
199         return 0;
200 }
201
202 /// @brief Send a can message from a can_message_t object.
203 /// @param[in] can bus used to send the message
204 /// @param[in] can_msg the can message object to send
205 bool can_bus_dev_t::shims_send(const uint32_t arbitration_id, const uint8_t* data, const uint8_t size)
206 {
207         ssize_t nbytes;
208         canfd_frame f;
209
210         f.can_id = arbitration_id;
211         f.len = size;
212         ::memcpy(f.data, data, size);
213
214         if(can_socket_.socket())
215         {
216                 nbytes = ::sendto(can_socket_.socket(), &f, sizeof(struct canfd_frame), 0,
217                         (struct sockaddr*)&txAddress_, sizeof(txAddress_));
218                 if (nbytes == -1)
219                 {
220                         ERROR(binder_interface, "send_can_message: Sending CAN frame failed.");
221                         return -1;
222                 }
223                 return (int)nbytes;
224         }
225         else
226         {
227                 ERROR(binder_interface, "send_can_message: socket not initialized. Attempt to reopen can device socket.");
228                 open();
229         }
230         return 0;
231 }