Release 260111

common/gpio.py

@@ -0,0 +1,89 @@
+import os
+import fcntl
+import ctypes
+from functools import cache
+
+def gpio_init(pin: int, output: bool) -> None:
+  try:
+    with open(f"/sys/class/gpio/gpio{pin}/direction", 'wb') as f:
+      f.write(b"out" if output else b"in")
+  except Exception as e:
+    print(f"Failed to set gpio {pin} direction: {e}")
+
+def gpio_set(pin: int, high: bool) -> None:
+  try:
+    with open(f"/sys/class/gpio/gpio{pin}/value", 'wb') as f:
+      f.write(b"1" if high else b"0")
+  except Exception as e:
+    print(f"Failed to set gpio {pin} value: {e}")
+
+def gpio_read(pin: int) -> bool | None:
+  val = None
+  try:
+    with open(f"/sys/class/gpio/gpio{pin}/value", 'rb') as f:
+      val = bool(int(f.read().strip()))
+  except Exception as e:
+    print(f"Failed to set gpio {pin} value: {e}")
+
+  return val
+
+def gpio_export(pin: int) -> None:
+  if os.path.isdir(f"/sys/class/gpio/gpio{pin}"):
+    return
+
+  try:
+    with open("/sys/class/gpio/export", 'w') as f:
+      f.write(str(pin))
+  except Exception:
+    print(f"Failed to export gpio {pin}")
+
+@cache
+def get_irq_action(irq: int) -> list[str]:
+  try:
+    with open(f"/sys/kernel/irq/{irq}/actions") as f:
+      actions = f.read().strip().split(',')
+      return actions
+  except FileNotFoundError:
+    return []
+
+def get_irqs_for_action(action: str) -> list[str]:
+  ret = []
+  with open("/proc/interrupts") as f:
+    for l in f.readlines():
+      irq = l.split(':')[0].strip()
+      if irq.isdigit() and action in get_irq_action(irq):
+        ret.append(irq)
+  return ret
+
+# *** gpiochip ***
+
+class gpioevent_data(ctypes.Structure):
+  _fields_ = [
+    ("timestamp", ctypes.c_uint64),
+    ("id", ctypes.c_uint32),
+  ]
+
+class gpioevent_request(ctypes.Structure):
+  _fields_ = [
+    ("lineoffset", ctypes.c_uint32),
+    ("handleflags", ctypes.c_uint32),
+    ("eventflags", ctypes.c_uint32),
+    ("label", ctypes.c_char * 32),
+    ("fd", ctypes.c_int)
+  ]
+
+def gpiochip_get_ro_value_fd(label: str, gpiochip_id: int, pin: int) -> int:
+  GPIOEVENT_REQUEST_BOTH_EDGES = 0x3
+  GPIOHANDLE_REQUEST_INPUT = 0x1
+  GPIO_GET_LINEEVENT_IOCTL = 0xc030b404
+
+  rq = gpioevent_request()
+  rq.lineoffset = pin
+  rq.handleflags = GPIOHANDLE_REQUEST_INPUT
+  rq.eventflags = GPIOEVENT_REQUEST_BOTH_EDGES
+  rq.label = label.encode('utf-8')[:31] + b'\0'
+
+  fd = os.open(f"/dev/gpiochip{gpiochip_id}", os.O_RDONLY)
+  fcntl.ioctl(fd, GPIO_GET_LINEEVENT_IOCTL, rq)
+  os.close(fd)
+  return int(rq.fd)