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 <phosphor-logging/elog-errors.hpp>
9 #include <phosphor-logging/elog.hpp>
10 #include <phosphor-logging/lg2.hpp>
11 
12 #include <fstream>
13 
14 namespace phosphor
15 {
16 namespace gpio
17 {
18 namespace presence
19 {
20 
21 using namespace phosphor::logging;
22 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
23 
24 constexpr auto INVENTORY_PATH = "/xyz/openbmc_project/inventory";
25 constexpr auto INVENTORY_INTF = "xyz.openbmc_project.Inventory.Manager";
26 
27 constexpr auto MAPPER_BUSNAME = "xyz.openbmc_project.ObjectMapper";
28 constexpr auto MAPPER_PATH = "/xyz/openbmc_project/object_mapper";
29 constexpr auto MAPPER_INTERFACE = "xyz.openbmc_project.ObjectMapper";
30 
31 std::string getService(const std::string& path, const std::string& interface,
32                        sdbusplus::bus_t& bus)
33 {
34     auto mapperCall = bus.new_method_call(MAPPER_BUSNAME, MAPPER_PATH,
35                                           MAPPER_INTERFACE, "GetObject");
36 
37     mapperCall.append(path);
38     mapperCall.append(std::vector<std::string>({interface}));
39 
40     std::map<std::string, std::vector<std::string>> mapperResponse;
41     try
42     {
43         auto mapperResponseMsg = bus.call(mapperCall);
44         mapperResponseMsg.read(mapperResponse);
45     }
46     catch (const sdbusplus::exception_t& e)
47     {
48         lg2::error(
49             "Error in mapper call to get service name, path: {PATH}, interface: {INTERFACE}, error: {ERROR}",
50             "PATH", path, "INTERFACE", interface, "ERROR", e);
51         elog<InternalFailure>();
52     }
53 
54     return mapperResponse.begin()->first;
55 }
56 
57 void Presence::determinePresence()
58 {
59     auto present = false;
60     auto value = static_cast<int>(0);
61     auto fetch_rc =
62         libevdev_fetch_event_value(devicePtr.get(), EV_KEY, key, &value);
63     if (0 == fetch_rc)
64     {
65         lg2::error("Device does not support event type, key: {KEYCODE}",
66                    "KEYCODE", key);
67         elog<InternalFailure>();
68         return;
69     }
70     if (value > 0)
71     {
72         present = true;
73     }
74 
75     updateInventory(present);
76 }
77 
78 // Callback handler when there is an activity on the FD
79 int Presence::processEvents(sd_event_source*, int, uint32_t, void* userData)
80 {
81     auto presence = static_cast<Presence*>(userData);
82 
83     presence->analyzeEvent();
84     return 0;
85 }
86 
87 // Analyzes the GPIO event
88 void Presence::analyzeEvent()
89 {
90     // Data returned
91     struct input_event ev{};
92     int rc = 0;
93 
94     // While testing, observed that not having a loop here was leading
95     // into events being missed.
96     while (rc >= 0)
97     {
98         // Wait until no more events are available on the device.
99         rc = libevdev_next_event(devicePtr.get(), LIBEVDEV_READ_FLAG_NORMAL,
100                                  &ev);
101         if (rc < 0)
102         {
103             // There was an error waiting for events, mostly that there are no
104             // events to be read.. So continue waiting...
105             return;
106         }
107 
108         if (rc == LIBEVDEV_READ_STATUS_SUCCESS)
109         {
110             if (ev.type == EV_SYN && ev.code == SYN_REPORT)
111             {
112                 continue;
113             }
114             else if (ev.code == key)
115             {
116                 auto present = false;
117                 if (ev.value > 0)
118                 {
119                     present = true;
120                     std::this_thread::sleep_for(
121                         std::chrono::milliseconds(delay));
122                     bindOrUnbindDrivers(present);
123                     updateInventory(present);
124                 }
125                 else
126                 {
127                     updateInventory(present);
128                     bindOrUnbindDrivers(present);
129                 }
130             }
131         }
132     }
133 
134     return;
135 }
136 
137 Presence::ObjectMap Presence::getObjectMap(bool present)
138 {
139     ObjectMap invObj;
140     InterfaceMap invIntf;
141     PropertyMap invProp;
142 
143     invProp.emplace("Present", present);
144     invProp.emplace("PrettyName", name);
145     invIntf.emplace("xyz.openbmc_project.Inventory.Item", std::move(invProp));
146     // Add any extra interfaces we want to associate with the inventory item
147     for (auto& iface : ifaces)
148     {
149         invIntf.emplace(iface, PropertyMap());
150     }
151     invObj.emplace(std::move(inventory), std::move(invIntf));
152 
153     return invObj;
154 }
155 
156 void Presence::updateInventory(bool present)
157 {
158     ObjectMap invObj = getObjectMap(present);
159 
160     lg2::info(
161         "Updating inventory present property value to {PRESENT}, path: {PATH}",
162         "PRESENT", present, "PATH", inventory);
163 
164     auto invService = getService(INVENTORY_PATH, INVENTORY_INTF, bus);
165 
166     // Update inventory
167     auto invMsg = bus.new_method_call(invService.c_str(), INVENTORY_PATH,
168                                       INVENTORY_INTF, "Notify");
169     invMsg.append(std::move(invObj));
170     try
171     {
172         auto invMgrResponseMsg = bus.call(invMsg);
173     }
174     catch (const sdbusplus::exception_t& e)
175     {
176         lg2::error(
177             "Error in inventory manager call to update inventory: {ERROR}",
178             "ERROR", e);
179         elog<InternalFailure>();
180     }
181 }
182 
183 void Presence::bindOrUnbindDrivers(bool present)
184 {
185     auto action = (present) ? "bind" : "unbind";
186 
187     for (auto& driver : drivers)
188     {
189         auto path = std::get<pathField>(driver) / action;
190         auto device = std::get<deviceField>(driver);
191 
192         if (present)
193         {
194             lg2::info("Binding a {DEVICE} driver: {PATH}", "DEVICE", device,
195                       "PATH", path);
196         }
197         else
198         {
199             lg2::info("Unbinding a {DEVICE} driver: {PATH}", "DEVICE", device,
200                       "PATH", path);
201         }
202 
203         std::ofstream file;
204 
205         file.exceptions(std::ofstream::failbit | std::ofstream::badbit |
206                         std::ofstream::eofbit);
207 
208         try
209         {
210             file.open(path);
211             file << device;
212             file.close();
213         }
214         catch (const std::exception& e)
215         {
216             lg2::error(
217                 "Failed binding or unbinding a {DEVICE} after a card was removed or added, path: {PATH}, error: {ERROR}",
218                 "DEVICE", device, "PATH", path, "ERROR", e);
219         }
220     }
221 }
222 
223 } // namespace presence
224 } // namespace gpio
225 } // namespace phosphor
226