gallium/hud: Add power sensor support

Implement support for power based sensors, reporting units in
milli-watts and watts.

Also, minor cleanup - change the related if block to a switch.

Tested with two different power sensors, including the nouveau
'power1' sensors on a GTX950 card.

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/auxiliary/hud/hud_context.c

@@ -261,6 +261,7 @@ number_to_human_readable(uint64_t num, uint64_t max_value,
    static const char *temperature_units[] = {" C"};
    static const char *volt_units[] = {" mV", " V"};
    static const char *amp_units[] = {" mA", " A"};
+   static const char *watt_units[] = {" mW", " W"};
 
    const char **units;
    unsigned max_unit;
@@ -301,6 +302,10 @@ number_to_human_readable(uint64_t num, uint64_t max_value,
       max_unit = ARRAY_SIZE(hz_units)-1;
       units = hz_units;
       break;
+   case PIPE_DRIVER_QUERY_TYPE_WATTS:
+      max_unit = ARRAY_SIZE(watt_units)-1;
+      units = watt_units;
+      break;
    default:
       if (max_value == 100) {
          max_unit = ARRAY_SIZE(percent_units)-1;
@@ -1067,6 +1072,11 @@ hud_parse_env_var(struct hud_context *hud, const char *env)
                                         SENSORS_CURRENT_CURRENT);
          pane->type = PIPE_DRIVER_QUERY_TYPE_AMPS;
       }
+      else if (sscanf(name, "sensors_pow_cu-%s", arg_name) == 1) {
+         hud_sensors_temp_graph_install(pane, arg_name,
+                                        SENSORS_POWER_CURRENT);
+         pane->type = PIPE_DRIVER_QUERY_TYPE_WATTS;
+      }
 #endif
       else if (strcmp(name, "samples-passed") == 0 &&
                has_occlusion_query(hud->pipe->screen)) {

src/gallium/auxiliary/hud/hud_private.h

@@ -124,6 +124,7 @@ int hud_get_num_sensors(bool displayhelp);
 #define SENSORS_TEMP_CRITICAL    2
 #define SENSORS_VOLTAGE_CURRENT  3
 #define SENSORS_CURRENT_CURRENT  4
+#define SENSORS_POWER_CURRENT    5
 void hud_sensors_temp_graph_install(struct hud_pane *pane, const char *dev_name,
                                     unsigned int mode);
 #endif

src/gallium/auxiliary/hud/hud_sensors_temp.c

@@ -119,6 +119,15 @@ get_sensor_values(struct sensors_temp_info *sti)
       if (sf)
          sti->critical = get_value(sti->chip, sf);
       break;
+   case SENSORS_POWER_CURRENT:
+      sf = sensors_get_subfeature(sti->chip, sti->feature,
+                                  SENSORS_SUBFEATURE_POWER_INPUT);
+      if (sf) {
+         /* Sensors API returns in WATTs, even though driver is reporting mW,
+          * convert back to mW */
+         sti->current = get_value(sti->chip, sf) * 1000;
+      }
+      break;
    }
 
    sf = sensors_get_subfeature(sti->chip, sti->feature,
@@ -173,6 +182,9 @@ query_sti_load(struct hud_graph *gr)
          case SENSORS_CURRENT_CURRENT:
             hud_graph_add_value(gr, (uint64_t) sti->current);
             break;
+         case SENSORS_POWER_CURRENT:
+            hud_graph_add_value(gr, (uint64_t) sti->current);
+            break;
          }
 
          sti->last_time = now;
@@ -217,6 +229,7 @@ hud_sensors_temp_graph_install(struct hud_pane *pane, const char *dev_name,
           mode == SENSORS_VOLTAGE_CURRENT ? "VOLTS" :
           mode == SENSORS_CURRENT_CURRENT ? "AMPS" :
           mode == SENSORS_TEMP_CURRENT ? "CU" :
+          mode == SENSORS_POWER_CURRENT ? "POWER" :
           mode == SENSORS_TEMP_CRITICAL ? "CR" : "UNDEFINED");
 #endif
 
@@ -234,6 +247,7 @@ hud_sensors_temp_graph_install(struct hud_pane *pane, const char *dev_name,
            sti->mode == SENSORS_VOLTAGE_CURRENT ? "Volts" :
            sti->mode == SENSORS_CURRENT_CURRENT ? "Amps" :
            sti->mode == SENSORS_TEMP_CURRENT ? "Curr" :
+           sti->mode == SENSORS_POWER_CURRENT ? "Pow" :
            sti->mode == SENSORS_TEMP_CRITICAL ? "Crit" : "Unkn");
 
    gr->query_data = sti;
@@ -256,6 +270,9 @@ hud_sensors_temp_graph_install(struct hud_pane *pane, const char *dev_name,
    case SENSORS_CURRENT_CURRENT:
       hud_pane_set_max_value(pane, 5000);
       break;
+   case SENSORS_POWER_CURRENT:
+      hud_pane_set_max_value(pane, 5000 /* mW */);
+      break;
    }
 }
 
@@ -303,19 +320,27 @@ build_sensor_list(void)
          /* Create a 'current' and 'critical' object pair.
           * Ignore sensor if its not temperature based.
           */
-         if (feature->type == SENSORS_FEATURE_TEMP) {
+         switch(feature->type) {
+         case SENSORS_FEATURE_TEMP:
             create_object(name, featurename, chip, feature,
                           SENSORS_TEMP_CURRENT);
             create_object(name, featurename, chip, feature,
                           SENSORS_TEMP_CRITICAL);
-         }
-         if (feature->type == SENSORS_FEATURE_IN) {
+            break;
+         case SENSORS_FEATURE_IN:
             create_object(name, featurename, chip, feature,
                           SENSORS_VOLTAGE_CURRENT);
-         }
-         if (feature->type == SENSORS_FEATURE_CURR) {
+            break;
+         case SENSORS_FEATURE_CURR:
             create_object(name, featurename, chip, feature,
                           SENSORS_CURRENT_CURRENT);
+            break;
+         case SENSORS_FEATURE_POWER:
+            create_object(name, featurename, chip, feature,
+                          SENSORS_POWER_CURRENT);
+            break;
+         default:
+            break;
          }
          free(featurename);
       }
@@ -362,6 +387,9 @@ hud_get_num_sensors(bool displayhelp)
          case SENSORS_CURRENT_CURRENT:
             snprintf(line, sizeof(line), "    sensors_curr_cu-%s", sti->name);
             break;
+         case SENSORS_POWER_CURRENT:
+            snprintf(line, sizeof(line), "    sensors_pow_cu-%s", sti->name);
+            break;
          }
 
          puts(line);

src/gallium/include/pipe/p_defines.h

@@ -969,6 +969,7 @@ enum pipe_driver_query_type
    PIPE_DRIVER_QUERY_TYPE_TEMPERATURE,
    PIPE_DRIVER_QUERY_TYPE_VOLTS,
    PIPE_DRIVER_QUERY_TYPE_AMPS,
+   PIPE_DRIVER_QUERY_TYPE_WATTS,
 };
 
 /* Whether an average value per frame or a cumulative value should be