srd: remove obsolete DDC-only I2C filter

[libsigrokdecode.git] / decoders / ddc / ddc.py

diff --git a/decoders/ddc/ddc.py b/decoders/ddc/ddc.py
deleted file mode 100644 (file)
index 2cb4552..0000000
--- a/decoders/ddc/ddc.py
+++ /dev/null
@@ -1,78 +0,0 @@
-##
-## This file is part of the sigrok project.
-##
-## Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
-##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; either version 3 of the License, or
-## (at your option) any later version.
-##
-## This program is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-## GNU General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with this program; if not, see <http://www.gnu.org/licenses/>.
-##
-
-'''
-This decoder extracts a DDC stream from an I2C session between a computer
-and a display device. The stream is output as plain bytes.
-
-Details:
-https://en.wikipedia.org/wiki/Display_Data_Channel
-'''
-
-import sigrokdecode as srd
-
-class Decoder(srd.Decoder):
-    api_version = 1
-    id = 'ddc'
-    name = 'DDC2'
-    longname = 'Display Data Channel'
-    desc = 'A protocol for communication between computers and displays.'
-    longdesc = ''
-    license = 'gplv3+'
-    inputs = ['i2c']
-    outputs = ['ddc2']
-    options = {}
-    annotations = [
-        ['Byte stream', 'DDC2B byte stream as read from display.'],
-    ]
-
-    def __init__(self, **kwargs):
-        self.state = None
-
-    def start(self, metadata):
-        self.out_proto = self.add(srd.OUTPUT_PROTO, 'ddc2')
-        self.out_ann = self.add(srd.OUTPUT_ANN, 'ddc2')
-
-    def decode(self, ss, es, data):
-        try:
-            cmd, data, ack_bit = data
-        except Exception as e:
-            raise Exception('Malformed I2C input: %s' % str(e)) from e
-
-        if self.state is None:
-            # Wait for the DDC session to start.
-            if cmd in ('START', 'START REPEAT'):
-                self.state = 'start'
-        elif self.state == 'start':
-            if cmd == 'ADDRESS READ' and data == 80:
-                # 80 is the I2C slave address of a connected display,
-                # so this marks the start of the DDC data transfer.
-                self.state = 'transfer'
-            elif cmd == 'STOP':
-                # Got back to the idle state.
-                self.state = None
-        elif self.state == 'transfer':
-            if cmd == 'DATA READ':
-                # There shouldn't be anything but data reads on this
-                # address, so ignore everything else.
-                self.put(ss, es, self.out_proto, data)
-                self.put(ss, es, self.out_ann, [0, ['0x%.2x' % data]])
-        else:
-            raise Exception('Invalid state: %s' % self.state)
-