1 /*
2 // Copyright (c) 2018 Intel Corporation
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 #pragma once
18 #include "common.hpp"
19 #include "gpio.hpp"
20 #include "xyz/openbmc_project/Chassis/Buttons/Reset/server.hpp"
21 #include "xyz/openbmc_project/Chassis/Common/error.hpp"
22 
23 #include <unistd.h>
24 
25 #include <phosphor-logging/elog-errors.hpp>
26 
27 const static constexpr char* RESET_BUTTON = "RESET_BUTTON";
28 
29 struct ResetButton
30     : sdbusplus::server::object::object<
31           sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::Reset>
32 {
33 
34     ResetButton(sdbusplus::bus::bus& bus, const char* path, EventPtr& event,
35                 sd_event_io_handler_t handler = ResetButton::EventHandler) :
36         sdbusplus::server::object::object<
37             sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::Reset>(
38             bus, path),
39         fd(-1), bus(bus), event(event), callbackHandler(handler)
40     {
41 
42         int ret = -1;
43 
44         // config gpio
45         ret = ::configGpio(RESET_BUTTON, &fd, bus);
46         if (ret < 0)
47         {
48             phosphor::logging::log<phosphor::logging::level::ERR>(
49                 "RESET_BUTTON: failed to config GPIO");
50             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
51                 IOError();
52         }
53 
54         ret = sd_event_add_io(event.get(), nullptr, fd, EPOLLPRI,
55                               callbackHandler, this);
56         if (ret < 0)
57         {
58             phosphor::logging::log<phosphor::logging::level::ERR>(
59                 "RESET_BUTTON: failed to add to event loop");
60             ::closeGpio(fd);
61             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
62                 IOError();
63         }
64     }
65 
66     ~ResetButton()
67     {
68         ::closeGpio(fd);
69     }
70 
71     void simPress() override;
72 
73     static int EventHandler(sd_event_source* es, int fd, uint32_t revents,
74                             void* userdata)
75     {
76 
77         int n = -1;
78         char buf = '0';
79 
80         if (!userdata)
81         {
82             phosphor::logging::log<phosphor::logging::level::ERR>(
83                 "RESET_BUTTON: userdata null!");
84             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
85                 IOError();
86         }
87 
88         ResetButton* resetButton = static_cast<ResetButton*>(userdata);
89 
90         if (!resetButton)
91         {
92             phosphor::logging::log<phosphor::logging::level::ERR>(
93                 "RESET_BUTTON: null pointer!");
94             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
95                 IOError();
96         }
97 
98         n = ::lseek(fd, 0, SEEK_SET);
99 
100         if (n < 0)
101         {
102             phosphor::logging::log<phosphor::logging::level::ERR>(
103                 "RESET_BUTTON: lseek error!");
104             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
105                 IOError();
106         }
107 
108         n = ::read(fd, &buf, sizeof(buf));
109         if (n < 0)
110         {
111             phosphor::logging::log<phosphor::logging::level::ERR>(
112                 "RESET_BUTTON: read error!");
113             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
114                 IOError();
115         }
116 
117         if (buf == '0')
118         {
119             phosphor::logging::log<phosphor::logging::level::DEBUG>(
120                 "RESET_BUTTON: pressed");
121             // emit pressed signal
122             resetButton->pressed();
123         }
124         else
125         {
126             phosphor::logging::log<phosphor::logging::level::DEBUG>(
127                 "RESET_BUTTON: released");
128             // released
129             resetButton->released();
130         }
131 
132         return 0;
133     }
134 
135   private:
136     int fd;
137     sdbusplus::bus::bus& bus;
138     EventPtr& event;
139     sd_event_io_handler_t callbackHandler;
140 };
141