GM: Add BSM from Powertrain Bus (#30861)

* Add GM BSM

* Move BSM check to fwdCam only

* Detect if BSM message if present

* Remove hardcoding

* Apply Commit Suggestion

Co-authored-by: Shane Smiskol <shane@smiskol.com>

* Cleanup Suggestions

* bump opendbc

* test out bsm

* BCMBlindSpotMonitors -> BCMBlindSpotMonitor

* Revert "test out bsm"

This reverts commit 0e166530e60165269c1be200f48ead9918d5fe96.

* up here

---------

Co-authored-by: Shane Smiskol <shane@smiskol.com>
old-commit-hash: 58ef40eb22

selfdrive/car/gm/carstate.py

@@ -113,6 +113,10 @@ class CarState(CarStateBase):
       if self.CP.pcmCruise:
         ret.cruiseState.nonAdaptive = cam_cp.vl["ASCMActiveCruiseControlStatus"]["ACCCruiseState"] not in (2, 3)
 
+    if self.CP.enableBsm:
+      ret.leftBlindspot = pt_cp.vl["BCMBlindSpotMonitor"]["LeftBSM"] == 1
+      ret.rightBlindspot = pt_cp.vl["BCMBlindSpotMonitor"]["RightBSM"] == 1
+
     return ret
 
   @staticmethod
@@ -146,6 +150,9 @@ class CarState(CarStateBase):
       ("ECMAcceleratorPos", 80),
     ]
 
+    if CP.enableBsm:
+      messages.append(("BCMBlindSpotMonitor", 10))
+
     # Used to read back last counter sent to PT by camera
     if CP.networkLocation == NetworkLocation.fwdCamera:
       messages += [

selfdrive/car/gm/interface.py

@@ -72,6 +72,7 @@ class CarInterface(CarInterfaceBase):
     ret.carName = "gm"
     ret.safetyConfigs = [get_safety_config(car.CarParams.SafetyModel.gm)]
     ret.autoResumeSng = False
+    ret.enableBsm = 0x142 in fingerprint[CanBus.POWERTRAIN]
 
     if candidate in EV_CAR:
       ret.transmissionType = TransmissionType.direct