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