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/Power/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* POWER_BUTTON = "POWER_BUTTON";
28 
29 struct PowerButton
30     : sdbusplus::server::object::object<
31           sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::Power>
32 {
33 
34     PowerButton(sdbusplus::bus::bus& bus, const char* path, EventPtr& event,
35                 sd_event_io_handler_t handler = PowerButton::EventHandler) :
36         sdbusplus::server::object::object<
37             sdbusplus::xyz::openbmc_project::Chassis::Buttons::server::Power>(
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(POWER_BUTTON, &fd, bus);
46         if (ret < 0)
47         {
48             phosphor::logging::log<phosphor::logging::level::ERR>(
49                 "POWER_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                 "POWER_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     ~PowerButton()
67     {
68         ::closeGpio(fd);
69     }
70 
71     void simPress() override;
72     void simLongPress() override;
73 
74     static const char* getGpioName()
75     {
76         return POWER_BUTTON;
77     }
78 
79     static int EventHandler(sd_event_source* es, int fd, uint32_t revents,
80                             void* userdata)
81     {
82 
83         int n = -1;
84         char buf = '0';
85 
86         if (!userdata)
87         {
88             phosphor::logging::log<phosphor::logging::level::ERR>(
89                 "POWER_BUTTON: userdata null!");
90             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
91                 IOError();
92         }
93 
94         PowerButton* powerButton = static_cast<PowerButton*>(userdata);
95 
96         if (!powerButton)
97         {
98             phosphor::logging::log<phosphor::logging::level::ERR>(
99                 "POWER_BUTTON: null pointer!");
100             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
101                 IOError();
102         }
103 
104         n = ::lseek(fd, 0, SEEK_SET);
105 
106         if (n < 0)
107         {
108             phosphor::logging::log<phosphor::logging::level::ERR>(
109                 "POWER_BUTTON: lseek error!");
110             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
111                 IOError();
112         }
113 
114         n = ::read(fd, &buf, sizeof(buf));
115         if (n < 0)
116         {
117             phosphor::logging::log<phosphor::logging::level::ERR>(
118                 "POWER_BUTTON: read error!");
119             throw sdbusplus::xyz::openbmc_project::Chassis::Common::Error::
120                 IOError();
121         }
122 
123         if (buf == '0')
124         {
125             phosphor::logging::log<phosphor::logging::level::DEBUG>(
126                 "POWER_BUTTON: pressed");
127             // emit pressed signal
128             powerButton->pressed();
129         }
130         else
131         {
132             phosphor::logging::log<phosphor::logging::level::DEBUG>(
133                 "POWER_BUTTON: released");
134             // released
135             powerButton->released();
136         }
137 
138         return 0;
139     }
140 
141   private:
142     int fd;
143     sdbusplus::bus::bus& bus;
144     EventPtr& event;
145     sd_event_io_handler_t callbackHandler;
146 };
147