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