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/ID/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* ID_BUTTON = "ID_BTN";
28 
29 struct IDButton
30     : sdbusplus::server::object::object<
31           sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::ID>
32 {
33 
34     IDButton(sdbusplus::bus::bus& bus, const char* path, EventPtr& event,
35              buttonConfig& buttonCfg,
36              sd_event_io_handler_t handler = IDButton::EventHandler) :
37         sdbusplus::server::object::object<
38             sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::ID>(
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                 "ID_BUTTON: failed to config GPIO");
53             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
54                 IOError();
55         }
56         // initialize the button io fd from the buttonConfig
57         // which has fd stored when configGroupGpio is called
58         fd = buttonIFConfig.gpios[0].fd;
59 
60         char buf;
61         ::read(fd, &buf, sizeof(buf));
62 
63         ret = sd_event_add_io(event.get(), nullptr, fd, EPOLLPRI,
64                               callbackHandler, this);
65         if (ret < 0)
66         {
67             phosphor::logging::log<phosphor::logging::level::ERR>(
68                 "ID_BUTTON: failed to add to event loop");
69             ::closeGpio(fd);
70             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
71                 IOError();
72         }
73     }
74 
75     ~IDButton()
76     {
77         ::closeGpio(fd);
78     }
79 
80     void simPress() override;
81 
82     static const std::string getGpioName()
83     {
84         return ID_BUTTON;
85     }
86 
87     static int EventHandler(sd_event_source* es, int fd, uint32_t revents,
88                             void* userdata)
89     {
90 
91         int n = -1;
92         char buf = '0';
93 
94         if (!userdata)
95         {
96             phosphor::logging::log<phosphor::logging::level::ERR>(
97                 "ID_BUTTON: userdata null!");
98             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
99                 IOError();
100         }
101 
102         IDButton* idButton = static_cast<IDButton*>(userdata);
103 
104         if (!idButton)
105         {
106             phosphor::logging::log<phosphor::logging::level::ERR>(
107                 "ID_BUTTON: null pointer!");
108             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
109                 IOError();
110         }
111 
112         n = ::lseek(fd, 0, SEEK_SET);
113 
114         if (n < 0)
115         {
116             phosphor::logging::log<phosphor::logging::level::ERR>(
117                 "ID_BUTTON: lseek error!");
118             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
119                 IOError();
120         }
121 
122         n = ::read(fd, &buf, sizeof(buf));
123         if (n < 0)
124         {
125             phosphor::logging::log<phosphor::logging::level::ERR>(
126                 "ID_BUTTON: read error!");
127             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
128                 IOError();
129         }
130 
131         if (buf == '0')
132         {
133             phosphor::logging::log<phosphor::logging::level::DEBUG>(
134                 "ID_BUTTON: pressed");
135             // emit pressed signal
136             idButton->pressed();
137         }
138         else
139         {
140             phosphor::logging::log<phosphor::logging::level::DEBUG>(
141                 "ID_BUTTON: released");
142             // released
143             idButton->released();
144         }
145 
146         return 0;
147     }
148 
149   private:
150     int fd;
151     buttonConfig buttonIFConfig;
152     sdbusplus::bus::bus& bus;
153     EventPtr& event;
154     sd_event_io_handler_t callbackHandler;
155 };
156