host_sensors: read extra hwmon chips (dell_smm) as env sensors

Boxes without IPMI (Dell workstations like dev-linux) expose CPU/ambient/
SODIMM/board temps via the BIOS SMM interface (dell_smm hwmon). Add
read_hwmon_env(): labelled temps from chips in HOST_HWMON_CHIPS (default
'dell_smm') as env sensors, named '<chip> <label>' with index suffix for
repeated labels. Merged into the host-poller env sweep. No-op on hosts without
the configured chips.

host_poller.py

@@ -22,7 +22,7 @@ import time
 from services import store
 from services.cache import close_cache, init_cache, redis_available
 from services.host import get_host_drives
-from services.host_sensors import read_coretemp, read_ipmi_temps
+from services.host_sensors import read_coretemp, read_hwmon_env, read_ipmi_temps
 
 logging.basicConfig(
     level=logging.INFO,
@@ -47,7 +47,7 @@ async def sweep_env() -> None:
     except Exception as e:
         errors.append(f"ipmi:{e}")
         ipmi = []
-    env = [s for s in ipmi if s.get("kind") == "env"]
+    env = [s for s in ipmi if s.get("kind") == "env"] + read_hwmon_env()
     cpu = read_coretemp() or [s for s in ipmi if s.get("kind") == "cpu"]
 
     await store.set_host_sensors({

services/host_sensors.py

@@ -7,7 +7,9 @@ coretemp is a cheap sysfs read.
 """
 import asyncio
 import logging
+import os
 import re
+from collections import Counter
 from pathlib import Path
 
 from services.hwgate import gate
@@ -67,6 +69,46 @@ def _parse_ipmi(text: str) -> list[dict]:
     return sensors
 
 
+def read_hwmon_env() -> list[dict]:
+    """Read labelled temps from extra hwmon chips as env sensors.
+
+    For boxes without IPMI (e.g. Dell workstations), the BIOS SMM interface
+    (`dell_smm`) exposes CPU/ambient/SODIMM/board temps. Chips are configurable
+    via HOST_HWMON_CHIPS (comma list; default "dell_smm"); set to "" to disable.
+    Names are "<chip> <label>", with the temp index appended when a label
+    repeats within a chip (e.g. dell_smm's multiple "Other" sensors).
+    """
+    chips = [c.strip() for c in os.environ.get("HOST_HWMON_CHIPS", "dell_smm").split(",") if c.strip()]
+    if not chips or not HWMON.is_dir():
+        return []
+    out: list[dict] = []
+    for hw in sorted(HWMON.iterdir()):
+        try:
+            chip = (hw / "name").read_text().strip()
+        except OSError:
+            continue
+        if chip not in chips:
+            continue
+        entries: list[tuple[str, str, int]] = []  # (idx, label, temp)
+        for label_f in sorted(hw.glob("temp*_label")):
+            try:
+                label = label_f.read_text().strip()
+            except OSError:
+                continue
+            input_f = label_f.with_name(label_f.name.replace("_label", "_input"))
+            try:
+                temp = round(int(input_f.read_text().strip()) / 1000)
+            except (OSError, ValueError):
+                continue
+            idx = label_f.name[len("temp"):-len("_label")]
+            entries.append((idx, label, temp))
+        dup = {lbl for lbl, n in Counter(l for _, l, _ in entries).items() if n > 1}
+        for idx, label, temp in entries:
+            name = f"{chip} {label}" + (f" {idx}" if label in dup else "")
+            out.append({"name": name, "temperature_c": temp, "status": "ok", "kind": "env"})
+    return out
+
+
 def read_coretemp() -> list[dict]:
     """CPU package temps from coretemp hwmon → [{name, temperature_c, kind}]."""
     cpus: list[dict] = []