Fixed MTP to work with TWRP

Documentation/isdn/README.avmb1

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+Driver for active AVM Controller.
+
+The driver provides a kernel capi2.0 Interface (kernelcapi) and
+on top of this a User-Level-CAPI2.0-interface (capi)
+and a driver to connect isdn4linux with CAPI2.0 (capidrv).
+The lowlevel interface can be used to implement a CAPI2.0
+also for passive cards since July 1999.
+
+The author can be reached at calle@calle.in-berlin.de.
+The command avmcapictrl is part of the isdn4k-utils.
+t4-files can be found at ftp://ftp.avm.de/cardware/b1/linux/firmware
+
+Currently supported cards:
+	B1 ISA (all versions)
+	B1 PCI
+	T1/T1B (HEMA card)
+	M1
+	M2
+	B1 PCMCIA
+
+Installing
+----------
+
+You need at least /dev/capi20 to load the firmware.
+
+mknod /dev/capi20 c 68 0
+mknod /dev/capi20.00 c 68 1
+mknod /dev/capi20.01 c 68 2
+.
+.
+.
+mknod /dev/capi20.19 c 68 20
+
+Running
+-------
+
+To use the card you need the t4-files to download the firmware.
+AVM GmbH provides several t4-files for the different D-channel
+protocols (b1.t4 for Euro-ISDN). Install these file in /lib/isdn.
+
+if you configure as modules load the modules this way:
+
+insmod /lib/modules/current/misc/capiutil.o
+insmod /lib/modules/current/misc/b1.o
+insmod /lib/modules/current/misc/kernelcapi.o
+insmod /lib/modules/current/misc/capidrv.o
+insmod /lib/modules/current/misc/capi.o
+
+if you have an B1-PCI card load the module b1pci.o
+insmod /lib/modules/current/misc/b1pci.o
+and load the firmware with
+avmcapictrl load /lib/isdn/b1.t4 1
+
+if you have an B1-ISA card load the module b1isa.o
+and add the card by calling
+avmcapictrl add 0x150 15
+and load the firmware by calling
+avmcapictrl load /lib/isdn/b1.t4 1
+
+if you have an T1-ISA card load the module t1isa.o
+and add the card by calling
+avmcapictrl add 0x450 15 T1 0
+and load the firmware by calling
+avmcapictrl load /lib/isdn/t1.t4 1
+
+if you have an PCMCIA card (B1/M1/M2) load the module b1pcmcia.o
+before you insert the card.
+
+Leased Lines with B1
+--------------------
+Init card and load firmware.
+For an D64S use "FV: 1" as phone number
+For an D64S2 use "FV: 1" and "FV: 2" for multilink
+or "FV: 1,2" to use CAPI channel bundling.
+
+/proc-Interface
+-----------------
+
+/proc/capi:
+  dr-xr-xr-x   2 root     root            0 Jul  1 14:03 .
+  dr-xr-xr-x  82 root     root            0 Jun 30 19:08 ..
+  -r--r--r--   1 root     root            0 Jul  1 14:03 applications
+  -r--r--r--   1 root     root            0 Jul  1 14:03 applstats
+  -r--r--r--   1 root     root            0 Jul  1 14:03 capi20
+  -r--r--r--   1 root     root            0 Jul  1 14:03 capidrv
+  -r--r--r--   1 root     root            0 Jul  1 14:03 controller
+  -r--r--r--   1 root     root            0 Jul  1 14:03 contrstats
+  -r--r--r--   1 root     root            0 Jul  1 14:03 driver
+  -r--r--r--   1 root     root            0 Jul  1 14:03 ncci
+  -r--r--r--   1 root     root            0 Jul  1 14:03 users
+
+/proc/capi/applications:
+   applid level3cnt datablkcnt datablklen ncci-cnt recvqueuelen
+	level3cnt: capi_register parameter
+	datablkcnt: capi_register parameter
+	ncci-cnt: current number of nccis (connections)
+	recvqueuelen: number of messages on receive queue
+   for example:
+1 -2 16 2048 1 0
+2 2 7 2048 1 0
+
+/proc/capi/applstats:
+   applid recvctlmsg nrecvdatamsg nsentctlmsg nsentdatamsg
+	recvctlmsg: capi messages received without DATA_B3_IND
+	recvdatamsg: capi DATA_B3_IND received
+	sentctlmsg: capi messages sent without DATA_B3_REQ
+	sentdatamsg: capi DATA_B3_REQ sent
+   for example:
+1 2057 1699 1721 1699
+
+/proc/capi/capi20: statistics of capi.o (/dev/capi20)
+    minor nopen nrecvdropmsg nrecvctlmsg nrecvdatamsg sentctlmsg sentdatamsg
+	minor: minor device number of capi device
+	nopen: number of calls to devices open
+	nrecvdropmsg: capi messages dropped (messages in recvqueue in close)
+	nrecvctlmsg: capi messages received without DATA_B3_IND
+	nrecvdatamsg: capi DATA_B3_IND received
+	nsentctlmsg: capi messages sent without DATA_B3_REQ
+	nsentdatamsg: capi DATA_B3_REQ sent
+
+   for example:
+1 2 18 0 16 2
+
+/proc/capi/capidrv: statistics of capidrv.o (capi messages)
+    nrecvctlmsg nrecvdatamsg sentctlmsg sentdatamsg
+	nrecvctlmsg: capi messages received without DATA_B3_IND
+	nrecvdatamsg: capi DATA_B3_IND received
+	nsentctlmsg: capi messages sent without DATA_B3_REQ
+	nsentdatamsg: capi DATA_B3_REQ sent
+   for example:
+2780 2226 2256 2226
+
+/proc/capi/controller:
+   controller drivername state cardname   controllerinfo
+   for example:
+1 b1pci      running  b1pci-e000       B1 3.07-01 0xe000 19
+2 t1isa      running  t1isa-450        B1 3.07-01 0x450 11 0
+3 b1pcmcia   running  m2-150           B1 3.07-01 0x150 5
+
+/proc/capi/contrstats:
+    controller nrecvctlmsg nrecvdatamsg sentctlmsg sentdatamsg
+	nrecvctlmsg: capi messages received without DATA_B3_IND
+	nrecvdatamsg: capi DATA_B3_IND received
+	nsentctlmsg: capi messages sent without DATA_B3_REQ
+	nsentdatamsg: capi DATA_B3_REQ sent
+   for example:
+1 2845 2272 2310 2274
+2 2 0 2 0
+3 2 0 2 0
+
+/proc/capi/driver:
+   drivername ncontroller
+   for example:
+b1pci                            1
+t1isa                            1
+b1pcmcia                         1
+b1isa                            0
+
+/proc/capi/ncci:
+   apllid ncci winsize sendwindow
+   for example:
+1 0x10101 8 0
+
+/proc/capi/users: kernelmodules that use the kernelcapi.
+   name
+   for example:
+capidrv
+capi20
+
+Questions
+---------
+Check out the FAQ (ftp.isdn4linux.de) or subscribe to the
+linux-avmb1@calle.in-berlin.de mailing list by sending
+a mail to majordomo@calle.in-berlin.de with
+subscribe linux-avmb1
+in the body.
+
+German documentation and several scripts can be found at
+ftp://ftp.avm.de/cardware/b1/linux/
+
+Bugs 
+----
+If you find any please let me know. 
+
+Enjoy,
+
+Carsten Paeth (calle@calle.in-berlin.de)