Release Vulpes OS 2.7-preview.22

tundra/devices/beatles/hardware_control.py

@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: MPL-2.0
+"""Fixed Nokia controls mounted writable only in the trusted broker namespace."""
+import math
+from pathlib import Path
+import time
+
+
+class HardwareControl:
+    def __init__(self,root=Path('/work/hardware-controls')):
+        self.root=root;self.original=None;self.pattern=[];self.next_at=0;self.on=False
+
+    def write(self,name,value):
+        (self.root/name).write_text(str(value)+'\n')
+
+    def request(self,value):
+        if not isinstance(value,dict):raise ValueError('INVALID_REQUEST')
+        op=value.get('operation')
+        if op=='screen':
+            level=value.get('level');enabled=value.get('enabled')
+            if type(enabled) is not bool or type(level) not in (int,float) or not math.isfinite(level) or not 0<=level<=1:
+                raise ValueError('INVALID_REQUEST')
+            maximum=int((self.root/'backlight-max').read_text())
+            if not 1<=maximum<=65535:raise RuntimeError('NOT_SUPPORTED')
+            if self.original is None:self.original=int((self.root/'backlight').read_text())
+            brightness=max(1,int(level*maximum+.5)) if enabled else 0
+            self.write('backlight',brightness)
+            actual=int((self.root/'backlight').read_text())
+            if actual!=brightness:raise RuntimeError('HARDWARE_READBACK_FAILED')
+            return {'brightness':actual,'maximum':maximum}
+        if op=='vibrate':
+            pattern=value.get('pattern')
+            if not isinstance(pattern,list) or len(pattern)>32 or any(type(n) is not int or not 0<=n<=10000 for n in pattern) or sum(pattern)>10000:
+                raise ValueError('INVALID_REQUEST')
+            self.write('vibrator',0)
+            self.pattern=list(pattern);self.on=False;self.next_at=0;self.tick()
+            return True
+        raise ValueError('NOT_SUPPORTED')
+
+    def tick(self):
+        now=time.monotonic()
+        while self.pattern and now>=self.next_at:
+            duration=self.pattern.pop(0);self.on=not self.on
+            self.write('vibrator',duration if self.on else 0)
+            self.next_at=now+duration/1000
+
+    def restore(self):
+        self.pattern=[]
+        for name,value in [('vibrator',0),('backlight',self.original)]:
+            if value is not None:
+                try:self.write(name,value)
+                except OSError:pass