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              sd_event_io_handler_t handler = IDButton::EventHandler) :
36         sdbusplus::server::object::object<
37             sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::ID>(
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(ID_BUTTON, &fd, bus);
46         if (ret < 0)
47         {
48             phosphor::logging::log<phosphor::logging::level::ERR>(
49                 "ID_BUTTON: failed to config GPIO");
50             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
51                 IOError();
52         }
53 
54         char buf;
55         ::read(fd, &buf, sizeof(buf));
56 
57         ret = sd_event_add_io(event.get(), nullptr, fd, EPOLLPRI,
58                               callbackHandler, this);
59         if (ret < 0)
60         {
61             phosphor::logging::log<phosphor::logging::level::ERR>(
62                 "ID_BUTTON: failed to add to event loop");
63             ::closeGpio(fd);
64             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
65                 IOError();
66         }
67     }
68 
69     ~IDButton()
70     {
71         ::closeGpio(fd);
72     }
73 
74     void simPress() override;
75 
76     static const char* getGpioName()
77     {
78         return ID_BUTTON;
79     }
80 
81     static int EventHandler(sd_event_source* es, int fd, uint32_t revents,
82                             void* userdata)
83     {
84 
85         int n = -1;
86         char buf = '0';
87 
88         if (!userdata)
89         {
90             phosphor::logging::log<phosphor::logging::level::ERR>(
91                 "ID_BUTTON: userdata null!");
92             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
93                 IOError();
94         }
95 
96         IDButton* idButton = static_cast<IDButton*>(userdata);
97 
98         if (!idButton)
99         {
100             phosphor::logging::log<phosphor::logging::level::ERR>(
101                 "ID_BUTTON: null pointer!");
102             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
103                 IOError();
104         }
105 
106         n = ::lseek(fd, 0, SEEK_SET);
107 
108         if (n < 0)
109         {
110             phosphor::logging::log<phosphor::logging::level::ERR>(
111                 "ID_BUTTON: lseek error!");
112             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
113                 IOError();
114         }
115 
116         n = ::read(fd, &buf, sizeof(buf));
117         if (n < 0)
118         {
119             phosphor::logging::log<phosphor::logging::level::ERR>(
120                 "ID_BUTTON: read error!");
121             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
122                 IOError();
123         }
124 
125         if (buf == '0')
126         {
127             phosphor::logging::log<phosphor::logging::level::DEBUG>(
128                 "ID_BUTTON: pressed");
129             // emit pressed signal
130             idButton->pressed();
131         }
132         else
133         {
134             phosphor::logging::log<phosphor::logging::level::DEBUG>(
135                 "ID_BUTTON: released");
136             // released
137             idButton->released();
138         }
139 
140         return 0;
141     }
142 
143   private:
144     int fd;
145     sdbusplus::bus::bus& bus;
146     EventPtr& event;
147     sd_event_io_handler_t callbackHandler;
148 };
149