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-$Id: INTERFACE,v 1.15.8.2 2001/03/13 16:17:07 kai Exp $
-
-Description of the Interface between Linklevel and Hardwarelevel
- of isdn4linux:
-
-
- The Communication between Linklevel (LL) and Hardwarelevel (HL)
- is based on the struct isdn_if (defined in isdnif.h).
-
- An HL-driver can register itself at LL by calling the function
- register_isdn() with a pointer to that struct. Prior to that, it has
- to preset some of the fields of isdn_if. The LL sets the rest of
- the fields. All further communication is done via callbacks using
- the function-pointers defined in isdn_if.
-
- Changes/Version numbering:
-
- During development of the ISDN subsystem, several changes have been
- made to the interface. Before it went into kernel, the package
- had a unique version number. The last version, distributed separately
- was 0.7.4. When the subsystem went into kernel, every functional unit
- got a separate version number. These numbers are shown at initialization,
- separated by slashes:
-
- c.c/t.t/n.n/p.p/a.a/v.v
-
- where
-
- c.c is the revision of the common code.
- t.t is the revision of the tty related code.
- n.n is the revision of the network related code.
- p.p is the revision of the ppp related code.
- a.a is the revision of the audio related code.
- v.v is the revision of the V.110 related code.
-
- Changes in this document are marked with '***CHANGEx' where x representing
- the version number. If that number starts with 0, it refers to the old,
- separately distributed package. If it starts with one of the letters
- above, it refers to the revision of the corresponding module.
- ***CHANGEIx refers to the revision number of the isdnif.h
-
-1. Description of the fields of isdn_if:
-
- int channels;
-
- This field has to be set by the HL-driver to the number of channels
- supported prior to calling register_isdn(). Upon return of the call,
- the LL puts an id there, which has to be used by the HL-driver when
- invoking the other callbacks.
-
- int maxbufsize;
-
- ***CHANGE0.6: New since this version.
-
- Also to be preset by the HL-driver. With this value the HL-driver
- tells the LL the maximum size of a data-packet it will accept.
-
- unsigned long features;
-
- To be preset by the HL-driver. Using this field, the HL-driver
- announces the features supported. At the moment this is limited to
- report the supported layer2 and layer3-protocols. For setting this
- field the constants ISDN_FEATURE..., declared in isdnif.h have to be
- used.
-
- ***CHANGE0.7.1: The line type (1TR6, EDSS1) has to be set.
-
- unsigned short hl_hdrlen;
-
- ***CHANGE0.7.4: New field.
-
- To be preset by the HL-driver, if it supports sk_buff's. The driver
- should put here the amount of additional space needed in sk_buff's for
- its internal purposes. Drivers not supporting sk_buff's should
- initialize this field to 0.
-
- void (*rcvcallb_skb)(int, int, struct sk_buff *)
-
- ***CHANGE0.7.4: New field.
-
- This field will be set by LL. The HL-driver delivers received data-
- packets by calling this function. Upon calling, the HL-driver must
- already have its private data pulled off the head of the sk_buff.
-
- Parameter:
- int driver-Id
- int Channel-number locally to the driver. (starting with 0)
- struct sk_buff * Pointer to sk_buff, containing received data.
-
- int (*statcallb)(isdn_ctrl*);
-
- This field will be set by LL. This function has to be called by the
- HL-driver for signaling status-changes or other events to the LL.
-
- Parameter:
- isdn_ctrl*
-
- The struct isdn_ctrl also defined in isdn_if. The exact meanings of its
- fields are described together with the descriptions of the possible
- events. Here is only a short description of the fields:
-
- driver = driver Id.
- command = event-type. (one of the constants ISDN_STAT_...)
- arg = depends on event-type.
- num = depends on event-type.
-
- Returnvalue:
- 0 on success, else -1
-
- int (*command)(isdn_ctrl*);
-
- This field has to be preset by the HL-driver. It points to a function,
- to be called by LL to perform functions like dialing, B-channel
- setup, etc. The exact meaning of the parameters is described with the
- descriptions of the possible commands.
-
- Parameter:
- isdn_ctrl*
- driver = driver-Id
- command = command to perform. (one of the constants ISDN_CMD_...)
- arg = depends on command.
- num = depends on command.
-
- Returnvalue:
- >=0 on success, else error-code (-ENODEV etc.)
-
- int (*writebuf_skb)(int, int, int, struct sk_buff *)
-
- ***CHANGE0.7.4: New field.
- ***CHANGEI.1.21: New field.
-
- This field has to be preset by the HL-driver. The given function will
- be called by the LL for delivering data to be send via B-Channel.
-
-
- Parameter:
- int driver-Id ***CHANGE0.7.4: New parameter.
- int channel-number locally to the HL-driver. (starts with 0)
- int ack ***ChangeI1.21: New parameter
- If this is !0, the driver has to signal the delivery
- by sending an ISDN_STAT_BSENT. If this is 0, the driver
- MUST NOT send an ISDN_STAT_BSENT.
- struct sk_buff * Pointer to sk_buff containing data to be send via
- B-channel.
-
- Returnvalue:
- Length of data accepted on success, else error-code (-EINVAL on
- oversized packets etc.)
-
- int (*writecmd)(u_char*, int, int, int, int);
-
- This field has to be preset by the HL-driver. The given function will be
- called to perform write-requests on /dev/isdnctrl (i.e. sending commands
- to the card) The data-format is hardware-specific. This function is
- intended for debugging only. It is not necessary for normal operation
- and never will be called by the tty-emulation- or network-code. If
- this function is not supported, the driver has to set NULL here.
-
- Parameter:
- u_char* pointer to data.
- int length of data.
- int flag: 0 = call from within kernel-space. (HL-driver must use
- memcpy, may NOT use schedule())
- 1 = call from user-space. (HL-driver must use
- memcpy_fromfs, use of schedule() allowed)
- int driver-Id.
- int channel-number locally to the HL-driver. (starts with 0)
-
-***CHANGEI1.14: The driver-Id and channel-number are new since this revision.
-
- Returnvalue:
- Length of data accepted on success, else error-code (-EINVAL etc.)
-
- int (*readstat)(u_char*, int, int, int, int);
-
- This field has to be preset by the HL-driver. The given function will be
- called to perform read-requests on /dev/isdnctrl (i.e. reading replies
- from the card) The data-format is hardware-specific. This function is
- intended for debugging only. It is not necessary for normal operation
- and never will be called by the tty-emulation- or network-code. If
- this function is not supported, the driver has to set NULL here.
-
- Parameter:
- u_char* pointer to data.
- int length of data.
- int flag: 0 = call from within kernel-space. (HL-driver must use
- memcpy, may NOT use schedule())
- 1 = call from user-space. (HL-driver must use
- memcpy_fromfs, use of schedule() allowed)
- int driver-Id.
- int channel-number locally to the HL-driver. (starts with 0)
-
-***CHANGEI1.14: The driver-Id and channel-number are new since this revision.
-
- Returnvalue:
- Length of data on success, else error-code (-EINVAL etc.)
-
- char id[20];
- ***CHANGE0.7: New since this version.
-
- This string has to be preset by the HL-driver. Its purpose is for
- identification of the driver by the user. Eg.: it is shown in the
- status-info of /dev/isdninfo. Furthermore it is used as Id for binding
- net-interfaces to a specific channel. If a string of length zero is
- given, upon return, isdn4linux will replace it by a generic name. (line0,
- line1 etc.) It is recommended to make this string configurable during
- module-load-time. (copy a global variable to this string.) For doing that,
- modules 1.2.8 or newer are necessary.
-
-2. Description of the commands, a HL-driver has to support:
-
- All commands will be performed by calling the function command() described
- above from within the LL. The field command of the struct-parameter will
- contain the desired command, the field driver is always set to the
- appropriate driver-Id.
-
- Until now, the following commands are defined:
-
-***CHANGEI1.34: The parameter "num" has been replaced by a union "parm" containing
- the old "num" and a new setup_type struct used for ISDN_CMD_DIAL
- and ISDN_STAT_ICALL callback.
-
- ISDN_CMD_IOCTL:
-
- This command is intended for performing ioctl-calls for configuring
- hardware or similar purposes (setting port-addresses, loading firmware
- etc.) For this purpose, in the LL all ioctl-calls with an argument
- >= IIOCDRVCTL (0x100) will be handed transparently to this
- function after subtracting 0x100 and placing the result in arg.
- Example:
- If a userlevel-program calls ioctl(0x101,...) the function gets
- called with the field command set to 1.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_IOCTL
- arg = Original ioctl-cmd - IIOCDRVCTL
- parm.num = first bytes filled with (unsigned long)arg
-
- Returnvalue:
- Depending on driver.
-
-
- ISDN_CMD_DIAL:
-
- This command is used to tell the HL-driver it should dial a given
- number.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_DIAL
- arg = channel-number locally to the driver. (starting with 0)
-
- parm.setup.phone = An ASCII-String containing the number to dial.
- parm.setup.eazmsn = An ASCII-Sting containing the own EAZ or MSN.
- parm.setup.si1 = The Service-Indicator.
- parm.setup.si2 = Additional Service-Indicator.
-
- If the Line has been designed as SPV (a special german
- feature, meaning semi-leased-line) the phone has to
- start with an "S".
- ***CHANGE0.6: In previous versions the EAZ has been given in the
- highbyte of arg.
- ***CHANGE0.7.1: New since this version: ServiceIndicator and AddInfo.
-
- ISDN_CMD_ACCEPTD:
-
- With this command, the HL-driver is told to accept a D-Channel-setup.
- (Response to an incoming call)
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_ACCEPTD
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_CMD_ACCEPTB:
-
- With this command, the HL-driver is told to perform a B-Channel-setup.
- (after establishing D-Channel-Connection)
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_ACCEPTB
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_CMD_HANGUP:
-
- With this command, the HL-driver is told to hangup (B-Channel if
- established first, then D-Channel). This command is also used for
- actively rejecting an incoming call.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_HANGUP
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_CMD_CLREAZ:
-
- With this command, the HL-driver is told not to signal incoming
- calls to the LL.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_CLREAZ
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_CMD_SETEAZ:
-
- With this command, the HL-driver is told to signal incoming calls for
- the given EAZs/MSNs to the LL.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_SETEAZ
- arg = channel-number locally to the driver. (starting with 0)
- parm.num = ASCII-String, containing the desired EAZ's/MSN's
- (comma-separated). If an empty String is given, the
- HL-driver should respond to ALL incoming calls,
- regardless of the destination-address.
- ***CHANGE0.6: New since this version the "empty-string"-feature.
-
- ISDN_CMD_GETEAZ: (currently unused)
-
- With this command, the HL-driver is told to report the current setting
- given with ISDN_CMD_SETEAZ.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_GETEAZ
- arg = channel-number locally to the driver. (starting with 0)
- parm.num = ASCII-String, containing the current EAZ's/MSN's
-
- ISDN_CMD_SETSIL: (currently unused)
-
- With this command, the HL-driver is told to signal only incoming
- calls with the given Service-Indicators.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_SETSIL
- arg = channel-number locally to the driver. (starting with 0)
- parm.num = ASCII-String, containing the desired Service-Indicators.
-
- ISDN_CMD_GETSIL: (currently unused)
-
- With this command, the HL-driver is told to return the current
- Service-Indicators it will respond to.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_SETSIL
- arg = channel-number locally to the driver. (starting with 0)
- parm.num = ASCII-String, containing the current Service-Indicators.
-
- ISDN_CMD_SETL2:
-
- With this command, the HL-driver is told to select the given Layer-2-
- protocol. This command is issued by the LL prior to ISDN_CMD_DIAL or
- ISDN_CMD_ACCEPTD.
-
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_SETL2
- arg = channel-number locally to the driver. (starting with 0)
- logical or'ed with (protocol-Id << 8)
- protocol-Id is one of the constants ISDN_PROTO_L2...
- parm = unused.
-
- ISDN_CMD_GETL2: (currently unused)
-
- With this command, the HL-driver is told to return the current
- setting of the Layer-2-protocol.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_GETL2
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
- Returnvalue:
- current protocol-Id (one of the constants ISDN_L2_PROTO)
-
- ISDN_CMD_SETL3:
-
- With this command, the HL-driver is told to select the given Layer-3-
- protocol. This command is issued by the LL prior to ISDN_CMD_DIAL or
- ISDN_CMD_ACCEPTD.
-
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_SETL3
- arg = channel-number locally to the driver. (starting with 0)
- logical or'ed with (protocol-Id << 8)
- protocol-Id is one of the constants ISDN_PROTO_L3...
- parm.fax = Pointer to T30_s fax struct. (fax usage only)
-
- ISDN_CMD_GETL2: (currently unused)
-
- With this command, the HL-driver is told to return the current
- setting of the Layer-3-protocol.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_GETL3
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
- Returnvalue:
- current protocol-Id (one of the constants ISDN_L3_PROTO)
-
- ISDN_CMD_PROCEED:
-
- With this command, the HL-driver is told to proceed with a incoming call.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_PROCEED
- arg = channel-number locally to the driver. (starting with 0)
- setup.eazmsn= empty string or string send as uus1 in DSS1 with
- PROCEED message
-
- ISDN_CMD_ALERT:
-
- With this command, the HL-driver is told to alert a proceeding call.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_ALERT
- arg = channel-number locally to the driver. (starting with 0)
- setup.eazmsn= empty string or string send as uus1 in DSS1 with
- ALERT message
-
- ISDN_CMD_REDIR:
-
- With this command, the HL-driver is told to redirect a call in proceeding
- or alerting state.
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_REDIR
- arg = channel-number locally to the driver. (starting with 0)
- setup.eazmsn= empty string or string send as uus1 in DSS1 protocol
- setup.screen= screening indicator
- setup.phone = redirected to party number
-
- ISDN_CMD_PROT_IO:
-
- With this call, the LL-driver invokes protocol specific features through
- the LL.
- The call is not implicitely bound to a connection.
-
- Parameter:
- driver = driver-Id
- command = ISDN_CMD_PROT_IO
- arg = The lower 8 Bits define the addressed protocol as defined
- in ISDN_PTYPE..., the upper bits are used to differentiate
- the protocol specific CMD.
-
- para = protocol and function specific. See isdnif.h for detail.
-
-
- ISDN_CMD_FAXCMD:
-
- With this command the HL-driver receives a fax sub-command.
- For details refer to INTERFACE.fax
-
- Parameter:
- driver = driver-Id.
- command = ISDN_CMD_FAXCMD
- arg = channel-number locally to the driver. (starting with 0)
- parm = unused.
-
-
-3. Description of the events to be signaled by the HL-driver to the LL.
-
- All status-changes are signaled via calling the previously described
- function statcallb(). The field command of the struct isdn_cmd has
- to be set by the HL-driver with the appropriate Status-Id (event-number).
- The field arg has to be set to the channel-number (locally to the driver,
- starting with 0) to which this event applies. (Exception: STAVAIL-event)
-
- Until now, the following Status-Ids are defined:
-
- ISDN_STAT_AVAIL:
-
- With this call, the HL-driver signals the availability of new data
- for readstat(). Used only for debugging-purposes, see description
- of readstat().
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_STAVAIL
- arg = length of available data.
- parm = unused.
-
- ISDN_STAT_ICALL:
- ISDN_STAT_ICALLW:
-
- With this call, the HL-driver signals an incoming call to the LL.
- If ICALLW is signalled the incoming call is a waiting call without
- a available B-chan.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_ICALL
- arg = channel-number, locally to the driver. (starting with 0)
- para.setup.phone = Callernumber.
- para.setup.eazmsn = CalledNumber.
- para.setup.si1 = Service Indicator.
- para.setup.si2 = Additional Service Indicator.
- para.setup.plan = octet 3 from Calling party number Information Element.
- para.setup.screen = octet 3a from Calling party number Information Element.
-
- Return:
- 0 = No device matching this call.
- 1 = At least one device matching this call (RING on ttyI).
- HL-driver may send ALERTING on the D-channel in this case.
- 2 = Call will be rejected.
- 3 = Incoming called party number is currently incomplete.
- Additional digits are required.
- Used for signalling with PtP connections.
- 4 = Call will be held in a proceeding state
- (HL driver sends PROCEEDING)
- Used when a user space prog needs time to interpret a call
- para.setup.eazmsn may be filled with an uus1 message of
- 30 octets maximum. Empty string if no uus.
- 5 = Call will be actively deflected to another party
- Only available in DSS1/EURO protocol
- para.setup.phone must be set to destination party number
- para.setup.eazmsn may be filled with an uus1 message of
- 30 octets maximum. Empty string if no uus.
- -1 = An error happened. (Invalid parameters for example.)
- The keypad support now is included in the dial command.
-
-
- ISDN_STAT_RUN:
-
- With this call, the HL-driver signals availability of the ISDN-card.
- (after initializing, loading firmware)
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_RUN
- arg = unused.
- parm = unused.
-
- ISDN_STAT_STOP:
-
- With this call, the HL-driver signals unavailability of the ISDN-card.
- (before unloading, while resetting/reconfiguring the card)
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_STOP
- arg = unused.
- parm = unused.
-
- ISDN_STAT_DCONN:
-
- With this call, the HL-driver signals the successful establishment of
- a D-Channel-connection. (Response to ISDN_CMD_ACCEPTD or ISDN_CMD_DIAL)
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_DCONN
- arg = channel-number, locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_STAT_BCONN:
-
- With this call, the HL-driver signals the successful establishment of
- a B-Channel-connection. (Response to ISDN_CMD_ACCEPTB or because the
- remote-station has initiated establishment)
-
- The HL driver should call this when the logical l2/l3 protocol
- connection on top of the physical B-channel is established.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_BCONN
- arg = channel-number, locally to the driver. (starting with 0)
- parm.num = ASCII-String, containing type of connection (for analog
- modem only). This will be appended to the CONNECT message
- e.g. 14400/V.32bis
-
- ISDN_STAT_DHUP:
-
- With this call, the HL-driver signals the shutdown of a
- D-Channel-connection. This could be a response to a prior ISDN_CMD_HANGUP,
- or caused by a remote-hangup or if the remote-station has actively
- rejected a call.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_DHUP
- arg = channel-number, locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_STAT_BHUP:
-
- With this call, the HL-driver signals the shutdown of a
- B-Channel-connection. This could be a response to a prior ISDN_CMD_HANGUP,
- or caused by a remote-hangup.
-
- The HL driver should call this as soon as the logical l2/l3 protocol
- connection on top of the physical B-channel is released.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_BHUP
- arg = channel-number, locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_STAT_CINF:
-
- With this call, the HL-driver delivers charge-unit information to the
- LL.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_CINF
- arg = channel-number, locally to the driver. (starting with 0)
- parm.num = ASCII string containing charge-units (digits only).
-
- ISDN_STAT_LOAD: (currently unused)
-
- ISDN_STAT_UNLOAD:
-
- With this call, the HL-driver signals that it will be unloaded now. This
- tells the LL to release all corresponding data-structures.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_UNLOAD
- arg = unused.
- parm = unused.
-
- ISDN_STAT_BSENT:
-
- With this call the HL-driver signals the delivery of a data-packet.
- This callback is used by the network-interfaces only, tty-Emulation
- does not need this call.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_BSENT
- arg = channel-number, locally to the driver. (starting with 0)
- parm.length = ***CHANGEI.1.21: New field.
- the driver has to set this to the original length
- of the skb at the time of receiving it from the linklevel.
-
- ISDN_STAT_NODCH:
-
- With this call, the driver has to respond to a prior ISDN_CMD_DIAL, if
- no D-Channel is available.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_NODCH
- arg = channel-number, locally to the driver. (starting with 0)
- parm = unused.
-
- ISDN_STAT_ADDCH:
-
- This call is for HL-drivers, which are unable to check card-type
- or numbers of supported channels before they have loaded any firmware
- using ioctl. Those HL-driver simply set the channel-parameter to a
- minimum channel-number when registering, and later if they know
- the real amount, perform this call, allocating additional channels.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_ADDCH
- arg = number of channels to be added.
- parm = unused.
-
- ISDN_STAT_CAUSE:
-
- With this call, the HL-driver delivers CAUSE-messages to the LL.
- Currently the LL does not use this messages. Their contents is simply
- logged via kernel-messages. Therefore, currently the format of the
- messages is completely free. However they should be printable.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_NODCH
- arg = channel-number, locally to the driver. (starting with 0)
- parm.num = ASCII string containing CAUSE-message.
-
- ISDN_STAT_DISPLAY:
-
- With this call, the HL-driver delivers DISPLAY-messages to the LL.
- Currently the LL does not use this messages.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_DISPLAY
- arg = channel-number, locally to the driver. (starting with 0)
- para.display= string containing DISPLAY-message.
-
- ISDN_STAT_PROT:
-
- With this call, the HL-driver delivers protocol specific infos to the LL.
- The call is not implicitely bound to a connection.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_PROT
- arg = The lower 8 Bits define the addressed protocol as defined
- in ISDN_PTYPE..., the upper bits are used to differentiate
- the protocol specific STAT.
-
- para = protocol and function specific. See isdnif.h for detail.
-
- ISDN_STAT_DISCH:
-
- With this call, the HL-driver signals the LL to disable or enable the
- use of supplied channel and driver.
- The call may be used to reduce the available number of B-channels after
- loading the driver. The LL has to ignore a disabled channel when searching
- for free channels. The HL driver itself never delivers STAT callbacks for
- disabled channels.
- The LL returns a nonzero code if the operation was not successful or the
- selected channel is actually regarded as busy.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_DISCH
- arg = channel-number, locally to the driver. (starting with 0)
- parm.num[0] = 0 if channel shall be disabled, else enabled.
-
- ISDN_STAT_L1ERR:
-
- ***CHANGEI1.21 new status message.
- A signal can be sent to the linklevel if an Layer1-error results in
- packet-loss on receive or send. The field errcode of the cmd.parm
- union describes the error more precisely.
-
- Parameter:
- driver = driver-Id
- command = ISDN_STAT_L1ERR
- arg = channel-number, locally to the driver. (starting with 0)
- parm.errcode= ISDN_STAT_L1ERR_SEND: Packet lost while sending.
- ISDN_STAT_L1ERR_RECV: Packet lost while receiving.
- ISDN_STAT_FAXIND:
-
- With this call the HL-driver signals a fax sub-command to the LL.
- For details refer to INTERFACE.fax
-
- Parameter:
- driver = driver-Id.
- command = ISDN_STAT_FAXIND
- arg = channel-number, locally to the driver. (starting with 0)
- parm = unused.
-