projects/usb_amr/sw: Import a small python3 test class for DLM interface

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

projects/usb_amr/sw/amrmodem.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+
+import struct
+
+import usb.core
+import usb.util
+
+
+class AMRModem:
+
+	USB_RT_CDC_SET_AUX_LINE_STATE = ((0x10 << 8) | 0x21)
+	USB_RT_CDC_SET_HOOK_STATE     = ((0x11 << 8) | 0x21)
+	USB_RT_CDC_SET_COMM_FEATURE   = ((0x02 << 8) | 0x21)
+	USB_RT_CDC_GET_COMM_FEATURE   = ((0x03 << 8) | 0xa1)
+	USB_RT_CDC_CLEAR_COMM_FEATURE = ((0x04 << 8) | 0x21)
+
+	ON_HOOK   = 0
+	OFF_HOOK  = 1
+	CALLED_ID = 2
+
+	def __init__(self):
+		# Locate device
+		self.dev = usb.core.find(idVendor=0x1d50, idProduct=0x6175)
+		if self.dev is None:
+			raise ValueError('Device not found')
+
+	def _ctrl(self, rt, wValue=0, data_or_wLength=None, timeout=None):
+		return self.dev.ctrl_transfer(
+			rt & 0xff,
+			rt >> 8,
+			wValue,
+			4,
+			data_or_wLength,
+			timeout
+		)
+
+	def set_aux_line_state(self, state):
+		self._ctrl(self.USB_RT_CDC_SET_AUX_LINE_STATE, 1 if state else 0)
+
+	def set_hook_state(self, state):
+		self._ctrl(self.USB_RT_CDC_SET_HOOK_STATE, state)
+
+	def set_country(self, cc):
+		self._ctrl(self.USB_RT_CDC_SET_COMM_FEATURE, 2, struct.pack('<H', cc))
+
+	def get_country(self):
+		return struct.unpack('<H', self._ctrl(self.USB_RT_CDC_GET_COMM_FEATURE, 2, 2))[0]
+
+	def clear_country(self):
+		self._ctrl(self.USB_RT_CDC_CLEAR_COMM_FEATURE, 2)
+
+	def read_notif(self, timeout=None):
+		return self.read(0x83, 8, timeout=timeout)