diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2019-04-18 22:43:36 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2019-05-31 11:13:10 +0200 |
| commit | 9c3c0c2048149d946d7f3ebdcbe70e2946750bfb (patch) | |
| tree | f970c07223bafd2bbd723bec1d8d9fdd1a56038a | |
| parent | 85993b8c9786fb24975dbcabebb1c75790d4fb6a (diff) | |
isdn: remove isdn4linux
With all isdn4linux hardware drivers gone, this is only a wrapper around
CAPI to support old user space. However, from looking at the mailing
list, it seems that the last time anyone asked about it was in 2014,
when the upgrade from a linux-2.4 installation failed, and mISDN was
suggested as a replacement.
The largest public ISDN network (Deutsche Telekom) was supposed to be
shut down 2018, which must have drastically reduced the number of legacy
installations.
When we last discussed removing i4l in 2016, Karsten Keil suggested
revisiting this in 2018. I guess this is overdue.
Link: http://listserv.isdn4linux.de/pipermail/isdn4linux/2014-October/006165.html
Link: https://patchwork.kernel.org/patch/8484861/#17900371
Link: https://listserv.isdn4linux.de/pipermail/isdn4linux/2019-April/thread.html
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
59 files changed, 2 insertions, 26860 deletions
diff --git a/Documentation/isdn/INTERFACE b/Documentation/isdn/INTERFACE deleted file mode 100644 index 5df17e5b25c8..000000000000 --- a/Documentation/isdn/INTERFACE +++ /dev/null @@ -1,759 +0,0 @@ -$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: -< |