1 #include "gpio_presence.hpp"
2 
3 #include "xyz/openbmc_project/Common/error.hpp"
4 
5 #include <fcntl.h>
6 #include <libevdev/libevdev.h>
7 
8 #include <fstream>
9 #include <phosphor-logging/elog-errors.hpp>
10 #include <phosphor-logging/elog.hpp>
11 #include <phosphor-logging/log.hpp>
12 
13 namespace phosphor
14 {
15 namespace gpio
16 {
17 namespace presence
18 {
19 
20 using namespace phosphor::logging;
21 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
22 
23 constexpr auto INVENTORY_PATH = "/xyz/openbmc_project/inventory";
24 constexpr auto INVENTORY_INTF = "xyz.openbmc_project.Inventory.Manager";
25 
26 constexpr auto MAPPER_BUSNAME = "xyz.openbmc_project.ObjectMapper";
27 constexpr auto MAPPER_PATH = "/xyz/openbmc_project/object_mapper";
28 constexpr auto MAPPER_INTERFACE = "xyz.openbmc_project.ObjectMapper";
29 
30 std::string getService(const std::string& path, const std::string& interface,
31                        sdbusplus::bus::bus& bus)
32 {
33     auto mapperCall = bus.new_method_call(MAPPER_BUSNAME, MAPPER_PATH,
34                                           MAPPER_INTERFACE, "GetObject");
35 
36     mapperCall.append(path);
37     mapperCall.append(std::vector<std::string>({interface}));
38 
39     auto mapperResponseMsg = bus.call(mapperCall);
40     if (mapperResponseMsg.is_method_error())
41     {
42         log<level::ERR>("Error in mapper call to get service name",
43                         entry("PATH=%s", path.c_str()),
44                         entry("INTERFACE=%s", interface.c_str()));
45         elog<InternalFailure>();
46     }
47 
48     std::map<std::string, std::vector<std::string>> mapperResponse;
49     mapperResponseMsg.read(mapperResponse);
50 
51     if (mapperResponse.empty())
52     {
53         log<level::ERR>("Error in mapper response for getting service name",
54                         entry("PATH=%s", path.c_str()),
55                         entry("INTERFACE=%s", interface.c_str()));
56         elog<InternalFailure>();
57     }
58 
59     return mapperResponse.begin()->first;
60 }
61 
62 void Presence::determinePresence()
63 {
64     auto present = false;
65     auto value = static_cast<int>(0);
66     auto fetch_rc =
67         libevdev_fetch_event_value(devicePtr.get(), EV_KEY, key, &value);
68     if (0 == fetch_rc)
69     {
70         log<level::ERR>("Device does not support event type",
71                         entry("KEYCODE=%d", key));
72         elog<InternalFailure>();
73         return;
74     }
75     if (value > 0)
76     {
77         present = true;
78     }
79 
80     updateInventory(present);
81 }
82 
83 // Callback handler when there is an activity on the FD
84 int Presence::processEvents(sd_event_source* es, int fd, uint32_t revents,
85                             void* userData)
86 {
87     auto presence = static_cast<Presence*>(userData);
88 
89     presence->analyzeEvent();
90     return 0;
91 }
92 
93 // Analyzes the GPIO event
94 void Presence::analyzeEvent()
95 {
96 
97     // Data returned
98     struct input_event ev
99     {
100     };
101     int rc = 0;
102 
103     // While testing, observed that not having a loop here was leading
104     // into events being missed.
105     while (rc >= 0)
106     {
107         // Wait until no more events are available on the device.
108         rc = libevdev_next_event(devicePtr.get(), LIBEVDEV_READ_FLAG_NORMAL,
109                                  &ev);
110         if (rc < 0)
111         {
112             // There was an error waiting for events, mostly that there are no
113             // events to be read.. So continue waiting...
114             return;
115         }
116 
117         if (rc == LIBEVDEV_READ_STATUS_SUCCESS)
118         {
119             if (ev.type == EV_SYN && ev.code == SYN_REPORT)
120             {
121                 continue;
122             }
123             else if (ev.code == key)
124             {
125                 auto present = false;
126                 if (ev.value > 0)
127                 {
128                     present = true;
129                 }
130                 updateInventory(present);
131                 bindOrUnbindDrivers(present);
132             }
133         }
134     }
135 
136     return;
137 }
138 
139 Presence::ObjectMap Presence::getObjectMap(bool present)
140 {
141     ObjectMap invObj;
142     InterfaceMap invIntf;
143     PropertyMap invProp;
144 
145     invProp.emplace("Present", present);
146     invProp.emplace("PrettyName", name);
147     invIntf.emplace("xyz.openbmc_project.Inventory.Item", std::move(invProp));
148     // Add any extra interfaces we want to associate with the inventory item
149     for (auto& iface : ifaces)
150     {
151         invIntf.emplace(iface, PropertyMap());
152     }
153     invObj.emplace(std::move(inventory), std::move(invIntf));
154 
155     return invObj;
156 }
157 
158 void Presence::updateInventory(bool present)
159 {
160     ObjectMap invObj = getObjectMap(present);
161 
162     log<level::INFO>("Updating inventory present property",
163                      entry("PRESENT=%d", present),
164                      entry("PATH=%s", inventory.c_str()));
165 
166     auto invService = getService(INVENTORY_PATH, INVENTORY_INTF, bus);
167 
168     // Update inventory
169     auto invMsg = bus.new_method_call(invService.c_str(), INVENTORY_PATH,
170                                       INVENTORY_INTF, "Notify");
171     invMsg.append(std::move(invObj));
172     auto invMgrResponseMsg = bus.call(invMsg);
173     if (invMgrResponseMsg.is_method_error())
174     {
175         log<level::ERR>("Error in inventory manager call to update inventory");
176         elog<InternalFailure>();
177     }
178 }
179 
180 void Presence::bindOrUnbindDrivers(bool present)
181 {
182     auto action = (present) ? "bind" : "unbind";
183 
184     for (auto& driver : drivers)
185     {
186         auto path = std::get<pathField>(driver) / action;
187         auto device = std::get<deviceField>(driver);
188 
189         if (present)
190         {
191             log<level::INFO>("Binding a device driver",
192                              entry("PATH=%s", path.c_str()),
193                              entry("DEVICE=%s", device.c_str()));
194         }
195         else
196         {
197             log<level::INFO>("Unbinding a device driver",
198                              entry("PATH=%s", path.c_str()),
199                              entry("DEVICE=%s", device.c_str()));
200         }
201 
202         std::ofstream file;
203 
204         file.exceptions(std::ofstream::failbit | std::ofstream::badbit |
205                         std::ofstream::eofbit);
206 
207         try
208         {
209             file.open(path);
210             file << device;
211             file.close();
212         }
213         catch (std::exception& e)
214         {
215             auto err = errno;
216 
217             log<level::ERR>("Failed binding or unbinding a device "
218                             "after a card was removed or added",
219                             entry("PATH=%s", path.c_str()),
220                             entry("DEVICE=%s", device.c_str()),
221                             entry("ERRNO=%d", err));
222         }
223     }
224 }
225 
226 } // namespace presence
227 } // namespace gpio
228 } // namespace phosphor
229