eeze/sensor: Add small udev module to read temperature from sysfs

This module does only provide a temperature sensor. Some pieces
borrowed from the temget code.

src/Makefile_Eeze.am

@@ -78,6 +78,14 @@ modules_eeze_sensor_fake_module_la_DEPENDENCIES = @USE_EEZE_INTERNAL_LIBS@
 modules_eeze_sensor_fake_module_la_LDFLAGS = -module @EFL_LTMODULE_FLAGS@
 modules_eeze_sensor_fake_module_la_LIBTOOLFLAGS = --tag=disable-static
 endif
+eezemodulesensorudevdir = $(libdir)/eeze/modules/sensor/udev/$(MODULE_ARCH)
+eezemodulesensorudev_LTLIBRARIES = modules/eeze/sensor/udev/module.la
+modules_eeze_sensor_udev_module_la_SOURCES = modules/eeze/sensor/udev/udev.c
+modules_eeze_sensor_udev_module_la_CPPFLAGS = @EEZE_CFLAGS@
+modules_eeze_sensor_udev_module_la_LIBADD = @USE_EEZE_LIBS@
+modules_eeze_sensor_udev_module_la_DEPENDENCIES = @USE_EEZE_INTERNAL_LIBS@
+modules_eeze_sensor_udev_module_la_LDFLAGS = -module @EFL_LTMODULE_FLAGS@
+modules_eeze_sensor_udev_module_la_LIBTOOLFLAGS = --tag=disable-static
 
 ### Binary
 

src/modules/eeze/sensor/udev/udev.c

@@ -0,0 +1,214 @@
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <sys/time.h>
+
+#include <Eina.h>
+#include <Ecore.h>
+#include <Eeze.h>
+#include <Eeze_Sensor.h>
+#include "eeze_sensor_private.h"
+
+static int _eeze_sensor_udev_log_dom = -1;
+
+#ifdef ERR
+#undef ERR
+#endif
+#define ERR(...)  EINA_LOG_DOM_ERR(_eeze_sensor_udev_log_dom, __VA_ARGS__)
+
+Eeze_Sensor_Module *esensor_module;
+
+Eina_List *devices;
+
+Eina_Bool
+udev_init(void)
+{
+   /* We only offer a temperature sensor right now */
+    Eeze_Sensor_Obj *obj = calloc(1, sizeof(Eeze_Sensor_Obj));
+    obj->type = EEZE_SENSOR_TYPE_TEMPERATURE;
+    esensor_module->sensor_list = eina_list_append(esensor_module->sensor_list, obj);
+
+   devices = eeze_udev_find_by_type(EEZE_UDEV_TYPE_IS_IT_HOT_OR_IS_IT_COLD_SENSOR, NULL);
+
+   return EINA_TRUE;
+}
+
+Eina_Bool
+udev_shutdown(void)
+{
+   char *data;
+
+   EINA_LIST_FREE(devices, data);
+     free(data);
+
+   return EINA_TRUE;
+}
+
+double
+_udev_read(void)
+{
+   Eina_List *l;
+   double cur, temp;
+   char *syspath;
+   const char *test;
+   char buf[256];
+   int x, y, sensors = 0;
+   temp = -274.0; /* Absolute zero is -273.15° C */
+
+   if (eina_list_count(devices))
+     {
+        temp = 0.0;
+        EINA_LIST_FOREACH(devices, l, syspath)
+          {
+             for (x = 1, y = 0; x < 15; x++)
+               {
+                  if (y >= 2) break;
+                  sprintf(buf, "temp%d_input", x);
+                  if ((test = eeze_udev_syspath_get_sysattr(syspath, buf)))
+                    {
+                       y = 0;
+                       cur = strtod(test, NULL);
+                       if (cur > -274.0)
+                         {
+                            /* temp is in celcius * 1000 */
+                            temp += (cur / 1000);
+                            sensors++;
+                         }
+                    }
+                  /* keep checking for temp sensors until we get 2 in a row that don't exist */
+                  else y++;
+               }
+           }
+   if (sensors)
+     temp /= (double)sensors;
+   }
+
+   return temp;
+}
+
+Eina_Bool
+udev_read(Eeze_Sensor_Type sensor_type, Eeze_Sensor_Obj *lobj)
+{
+   Eeze_Sensor_Obj *obj = NULL;
+
+   obj = eeze_sensor_obj_get(sensor_type);
+   if (obj == NULL)
+     {
+        ERR("No matching sensor object found in list");
+        return EINA_FALSE;
+     }
+
+   switch (sensor_type)
+     {
+      case EEZE_SENSOR_TYPE_TEMPERATURE:
+        obj->accuracy = -1;
+        obj->data[0] = _udev_read();
+        obj->data[1] = 0;
+        obj->data[2] = 0;
+        obj->timestamp = ecore_time_get();
+        break;
+
+      default:
+        ERR("Not possible to read from this sensor type.");
+        free(obj);
+        return EINA_FALSE;
+     }
+
+   memcpy(lobj, obj, sizeof(Eeze_Sensor_Obj));
+   free(obj);
+
+   return EINA_TRUE;
+}
+
+Eina_Bool
+udev_async_read(Eeze_Sensor_Type sensor_type, void *user_data EINA_UNUSED)
+{
+   Eeze_Sensor_Obj *obj = NULL;
+
+   obj = eeze_sensor_obj_get(sensor_type);
+   if (obj == NULL)
+     {
+        ERR("No matching sensor object found in list.");
+        return EINA_FALSE;
+     }
+
+   switch (sensor_type)
+     {
+      case EEZE_SENSOR_TYPE_TEMPERATURE:
+        obj->accuracy = -1;
+        obj->data[0] = _udev_read();
+        obj->data[1] = 0;
+        obj->data[2] = 0;
+        obj->timestamp = ecore_time_get();
+        ecore_event_add(EEZE_SENSOR_EVENT_TEMPERATURE, obj, NULL, NULL);
+        break;
+
+      default:
+        ERR("Not possible to read from this sensor type.");
+        free(obj);
+        return EINA_FALSE;
+     }
+   return EINA_TRUE;
+}
+
+/* This function gets called when the module is loaded from the disk. Its the
+ * entry point to anything in this module. After setting ourself up we register
+ * into the core of eeze sensor to make our functionality available.
+ */
+Eina_Bool
+sensor_udev_init(void)
+{
+
+   _eeze_sensor_udev_log_dom = eina_log_domain_register("eeze_sensor_udev", EINA_COLOR_BLUE);
+   if (_eeze_sensor_udev_log_dom < 0)
+     {
+        EINA_LOG_ERR("Could not register 'eeze_sensor_udev' log domain.");
+        return EINA_FALSE;
+     }
+
+   /* Check to avoid multi-init */
+   if (esensor_module) return EINA_FALSE;
+
+   /* Set module function pointer to allow calls into the module */
+   esensor_module = calloc(1, sizeof(Eeze_Sensor_Module));
+   if (!esensor_module) return EINA_FALSE;
+
+   /* Setup our function pointers to allow the core accessing this modules
+    * functions
+    */
+   esensor_module->init = udev_init;
+   esensor_module->shutdown = udev_shutdown;
+   esensor_module->read = udev_read;
+   esensor_module->async_read = udev_async_read;
+
+   if (!eeze_sensor_module_register("fake", esensor_module))
+     {
+        ERR("Failed to register udev module.");
+        return EINA_FALSE;
+     }
+   return EINA_TRUE;
+}
+
+/* Cleanup when the module gets unloaded. Unregister ourself from the core to
+ * avoid calls into a not loaded module.
+ */
+void
+sensor_udev_shutdown(void)
+{
+   Eeze_Sensor_Obj *sens;
+
+   eeze_sensor_module_unregister("udev");
+   EINA_LIST_FREE(esensor_module->sensor_list, sens)
+      free(sens);
+
+   free(esensor_module);
+   esensor_module = NULL;
+
+   eina_log_domain_unregister(_eeze_sensor_udev_log_dom);
+   _eeze_sensor_udev_log_dom = -1;
+}
+
+EINA_MODULE_INIT(sensor_udev_init);
+EINA_MODULE_SHUTDOWN(sensor_udev_shutdown);