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                 buttonConfig& buttonCfg,
36                 sd_event_io_handler_t handler = ResetButton::EventHandler) :
37         sdbusplus::server::object::object<
38             sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::Reset>(
39             bus, path),
40         fd(-1), buttonIFConfig(buttonCfg), bus(bus), event(event),
41         callbackHandler(handler)
42     {
43 
44         int ret = -1;
45 
46         // config group gpio based on the gpio defs read from the json file
47         ret = configGroupGpio(bus, buttonIFConfig);
48 
49         if (ret < 0)
50         {
51             phosphor::logging::log<phosphor::logging::level::ERR>(
52                 "RESET_BUTTON: failed to config GPIO");
53             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
54                 IOError();
55         }
56 
57         // initialize the button io fd from the buttonConfig
58         // which has fd stored when configGroupGpio is called
59         fd = buttonIFConfig.gpios[0].fd;
60 
61         char buf;
62         ::read(fd, &buf, sizeof(buf));
63 
64         ret = sd_event_add_io(event.get(), nullptr, fd, EPOLLPRI,
65                               callbackHandler, this);
66         if (ret < 0)
67         {
68             phosphor::logging::log<phosphor::logging::level::ERR>(
69                 "RESET_BUTTON: failed to add to event loop");
70             ::closeGpio(fd);
71             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
72                 IOError();
73         }
74     }
75 
76     ~ResetButton()
77     {
78         ::closeGpio(fd);
79     }
80 
81     void simPress() override;
82 
83     static const std::string getGpioName()
84     {
85         return RESET_BUTTON;
86     }
87 
88     static int EventHandler(sd_event_source* es, int fd, uint32_t revents,
89                             void* userdata)
90     {
91 
92         int n = -1;
93         char buf = '0';
94 
95         if (!userdata)
96         {
97             phosphor::logging::log<phosphor::logging::level::ERR>(
98                 "RESET_BUTTON: userdata null!");
99             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
100                 IOError();
101         }
102 
103         ResetButton* resetButton = static_cast<ResetButton*>(userdata);
104 
105         if (!resetButton)
106         {
107             phosphor::logging::log<phosphor::logging::level::ERR>(
108                 "RESET_BUTTON: null pointer!");
109             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
110                 IOError();
111         }
112 
113         n = ::lseek(fd, 0, SEEK_SET);
114 
115         if (n < 0)
116         {
117             phosphor::logging::log<phosphor::logging::level::ERR>(
118                 "RESET_BUTTON: lseek error!");
119             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
120                 IOError();
121         }
122 
123         n = ::read(fd, &buf, sizeof(buf));
124         if (n < 0)
125         {
126             phosphor::logging::log<phosphor::logging::level::ERR>(
127                 "RESET_BUTTON: read error!");
128             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
129                 IOError();
130         }
131 
132         if (buf == '0')
133         {
134             phosphor::logging::log<phosphor::logging::level::DEBUG>(
135                 "RESET_BUTTON: pressed");
136             // emit pressed signal
137             resetButton->pressed();
138         }
139         else
140         {
141             phosphor::logging::log<phosphor::logging::level::DEBUG>(
142                 "RESET_BUTTON: released");
143             // released
144             resetButton->released();
145         }
146 
147         return 0;
148     }
149 
150   private:
151     int fd;
152     buttonConfig buttonIFConfig; // button iface io details
153     sdbusplus::bus::bus& bus;
154     EventPtr& event;
155     sd_event_io_handler_t callbackHandler;
156 };
157