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-rw-r--r--decoders/hdcp/__init__.py27
-rw-r--r--decoders/hdcp/pd.py204
2 files changed, 231 insertions, 0 deletions
diff --git a/decoders/hdcp/__init__.py b/decoders/hdcp/__init__.py
new file mode 100644
index 0000000..8ead98b
--- /dev/null
+++ b/decoders/hdcp/__init__.py
@@ -0,0 +1,27 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2018 Dave Craig<dcraig@brightsign.biz>
+##
+## 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 2 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 stacks on top of the 'i2c' PD and decodes HDCP messages.
+
+Details:
+https://www.digital-cp.com/sites/default/files/specifications/HDCP%20on%20HDMI%20Specification%20Rev2_2_Final1.pdf
+'''
+
+from .pd import Decoder
diff --git a/decoders/hdcp/pd.py b/decoders/hdcp/pd.py
new file mode 100644
index 0000000..861cd5c
--- /dev/null
+++ b/decoders/hdcp/pd.py
@@ -0,0 +1,204 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2018 Dave Craig<dcraig@brightsign.biz>
+##
+## 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 2 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/>.
+##
+
+import sigrokdecode as srd
+
+msg_ids = {
+ 2: 'AKE_Init',
+ 3: 'AKE_Send_Cert',
+ 4: 'AKE_No_stored_km',
+ 5: 'AKE_Stored_km',
+
+ 7: 'AKE_Send_H_prime',
+ 8: 'AKE_Send_Pairing_Info',
+
+ 9: 'LC_Init',
+ 10: 'LC_Send_L_prime',
+
+ 11: 'SKE_Send_Eks',
+ 12: 'RepeaterAuth_Send_ReceiverID_List',
+
+ 15: 'RepeaterAuth_Send_Ack',
+ 16: 'RepeaterAuth_Stream_Manage',
+ 17: 'RepeaterAuth_Stream_Ready',
+}
+
+class Decoder(srd.Decoder):
+ api_version = 3
+ id = 'hdcp'
+ name = 'HDCP'
+ longname = 'HDCP over HDMI'
+ desc = 'HDCP protocol over HDMI.'
+ license = 'gplv2+'
+ inputs = ['i2c']
+ outputs = ['hdcp']
+ annotations = \
+ tuple(('message-0x%02X' % i, 'Message 0x%02X' % i) for i in range(18)) + (
+ ('summary', 'Summary'),
+ ('warnings', 'Warnings'),
+ )
+ annotation_rows = (
+ ('messages', 'Messages', tuple(range(18))),
+ ('summary', 'Summary', (18,)),
+ ('warnings', 'Warnings', (19,)),
+ )
+
+ def __init__(self):
+ self.reset()
+
+ def reset(self):
+ self.state = 'IDLE'
+ self.stack = []
+ self.msg = -1
+ self.ss = self.es = self.ss_block = self.es_block = 0
+ self.init_seq = []
+ self.valid = 0
+ self.type = ''
+
+ def start(self):
+ self.out_ann = self.register(srd.OUTPUT_ANN)
+
+ def putb(self, data):
+ self.put(self.ss_block, self.es_block, self.out_ann, data)
+
+ def decode(self, ss, es, data):
+ cmd, databyte = data
+
+ # Collect the 'BITS' packet, then return. The next packet is
+ # guaranteed to belong to these bits we just stored.
+ if cmd == 'BITS':
+ self.bits = databyte
+ return
+
+ self.ss, self.es = ss, es
+
+ # State machine.
+ if self.state == 'IDLE':
+ # Wait for an I2C START condition.
+ if cmd == 'START':
+ self.reset()
+ self.ss_block = ss
+ elif cmd != 'START REPEAT':
+ return
+ self.state = 'GET SLAVE ADDR'
+
+ elif self.state == 'GET SLAVE ADDR':
+ if cmd == 'ADDRESS READ':
+ self.state = 'BUFFER DATA'
+ if databyte != 0x3a:
+ self.state = 'IDLE'
+ elif cmd == 'ADDRESS WRITE':
+ self.state = 'WRITE OFFSET'
+ if databyte != 0x3a:
+ self.state = 'IDLE'
+
+ elif self.state == 'WRITE OFFSET':
+ if cmd == 'DATA WRITE':
+ if databyte == 0x00:
+ self.type = '1.4 Bksv - Receiver KSV'
+ elif databyte == 0x08:
+ self.type = '1.4 Ri\' - Link Verification'
+ elif databyte == 0x0a:
+ self.type = '1.4 Pj\' - Enhanced Link Verification'
+ elif databyte == 0x10:
+ self.type = '1.4 Aksv - Transmitter KSV'
+ self.state = 'BUFFER DATA'
+ elif databyte == 0x15:
+ self.type = '1.4 Ainfo- Transmitter KSV'
+ self.state = 'BUFFER DATA'
+ elif databyte == 0x18:
+ self.type = '1.4 An- Session random number'
+ self.state = 'BUFFER DATA'
+ elif databyte == 0x20:
+ self.type = '1.4 V\'H0'
+ elif databyte == 0x24:
+ self.type = '1.4 V\'H1'
+ elif databyte == 0x28:
+ self.type = '1.4 V\'H2'
+ elif databyte == 0x2c:
+ self.type = '1.4 V\'H3'
+ elif databyte == 0x30:
+ self.type = '1.4 V\'H4'
+ elif databyte == 0x40:
+ self.type = '1.4 Bcaps'
+ elif databyte == 0x41:
+ self.type = '1.4 Bstatus'
+ elif databyte == 0x43:
+ self.type = '1.4 KSV FIFO'
+ elif databyte == 0x50:
+ self.type = 'HDCP2Version'
+ elif databyte == 0x60:
+ self.type = 'Write_Message'
+ self.state = 'BUFFER DATA'
+ elif databyte == 0x70:
+ self.type = 'RxStatus'
+ elif databyte == 0x80:
+ self.type = 'Read_Message'
+
+ # If we are reading, then jump back to IDLE for a start repeat.
+ # If we are writing, then just continue onwards.
+ if self.state == 'BUFFER DATA':
+ self.state = 'BUFFER DATA'
+ elif self.type != '':
+ self.state = 'IDLE'
+
+ elif self.state == 'BUFFER DATA':
+ if (cmd == 'STOP') or (cmd == 'NACK'):
+ self.es_block = es
+ self.state = 'IDLE'
+ if self.type != '':
+ if self.stack:
+ if self.type == 'RxStatus':
+ rxstatus = (self.stack.pop() << 8) | self.stack.pop()
+ reauth_req = (rxstatus & 0x800) != 0
+ ready = (rxstatus & 0x400) != 0
+ length = rxstatus & 0x3ff
+ text = '%s, reauth %s, ready %s, length %s' % (self.type, reauth_req, ready, length)
+ self.putb([18, [text]])
+ elif self.type == '1.4 Bstatus':
+ bstatus = (self.stack.pop() << 8) | self.stack.pop()
+ device_count = bstatus & 0x7f
+ max_devs_exceeded = (bstatus & 0x80) != 0
+ depth = ((bstatus & 0x700) >> 8)
+ max_cascase_exceeded = bstatus & 0x800
+ hdmi_mode = (bstatus & 0x1000) != 0
+ text = '%s, %s devices, depth %s, hdmi mode %s' % (self.type, device_count, depth, hdmi_mode)
+ self.putb([18, [text]])
+ elif self.type == 'Read_Message':
+ msg = self.stack.pop(0)
+ self.putb([msg, ['%s, %s' % (self.type, msg_ids.get(msg, 'Invalid'))]])
+ elif self.type == 'Write_Message':
+ msg = self.stack.pop(0)
+ self.putb([msg, ['%s, %s' % (self.type, msg_ids.get(msg, 'Invalid'))]])
+ elif self.type == 'HDCP2Version':
+ version = self.stack.pop(0)
+ if (version & 0x4):
+ self.putb([18, ['HDCP2']])
+ else:
+ self.putb([18, ['NOT HDCP2']])
+ else:
+ self.putb([18, ['%s' % (self.type)]])
+ else:
+ self.putb([18, ['%s' % (self.type)]])
+ elif cmd == 'DATA READ':
+ # Stack up our data bytes.
+ self.stack.append(databyte)
+ elif cmd == 'DATA WRITE':
+ # Stack up our data bytes.
+ self.stack.append(databyte)
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2025-01-15 06:22:03 +0000