]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/isdn/gigaset/i4l.c
2 * Stuff used by all variants of the driver
4 * Copyright (c) 2001 by Stefan Eilers,
5 * Hansjoerg Lipp <hjlipp@web.de>,
6 * Tilman Schmidt <tilman@imap.cc>.
8 * =====================================================================
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 * =====================================================================
17 #include <linux/isdnif.h>
18 #include <linux/slab.h>
20 #define HW_HDR_LEN 2 /* Header size used to store ack info */
22 /* == Handling of I4L IO =====================================================*/
25 * called by LL to transmit data on an open channel
26 * inserts the buffer data into the send queue and starts the transmission
27 * Note that this operation must not sleep!
28 * When the buffer is processed completely, gigaset_skb_sent() should be called.
30 * driverID driver ID as assigned by LL
31 * channel channel number
32 * ack if != 0 LL wants to be notified on completion via
33 * statcallb(ISDN_STAT_BSENT)
34 * skb skb containing data to send
36 * number of accepted bytes
37 * 0 if temporarily unable to accept data (out of buffer space)
38 * <0 on error (eg. -EINVAL)
40 static int writebuf_from_LL(int driverID
, int channel
, int ack
,
43 struct cardstate
*cs
= gigaset_get_cs_by_id(driverID
);
45 unsigned char *ack_header
;
49 pr_err("%s: invalid driver ID (%d)\n", __func__
, driverID
);
52 if (channel
< 0 || channel
>= cs
->channels
) {
53 dev_err(cs
->dev
, "%s: invalid channel ID (%d)\n",
57 bcs
= &cs
->bcs
[channel
];
59 /* can only handle linear sk_buffs */
60 if (skb_linearize(skb
) < 0) {
61 dev_err(cs
->dev
, "%s: skb_linearize failed\n", __func__
);
67 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
68 driverID
, channel
, ack
, len
);
72 dev_notice(cs
->dev
, "%s: not ACKing empty packet\n",
76 if (len
> MAX_BUF_SIZE
) {
77 dev_err(cs
->dev
, "%s: packet too large (%d bytes)\n",
82 /* set up acknowledgement header */
83 if (skb_headroom(skb
) < HW_HDR_LEN
) {
84 /* should never happen */
85 dev_err(cs
->dev
, "%s: insufficient skb headroom\n", __func__
);
88 skb_set_mac_header(skb
, -HW_HDR_LEN
);
89 skb
->mac_len
= HW_HDR_LEN
;
90 ack_header
= skb_mac_header(skb
);
92 ack_header
[0] = len
& 0xff;
93 ack_header
[1] = len
>> 8;
95 ack_header
[0] = ack_header
[1] = 0;
97 gig_dbg(DEBUG_MCMD
, "skb: len=%u, ack=%d: %02x %02x",
98 len
, ack
, ack_header
[0], ack_header
[1]);
100 /* pass to device-specific module */
101 return cs
->ops
->send_skb(bcs
, skb
);
105 * gigaset_skb_sent() - acknowledge sending an skb
106 * @bcs: B channel descriptor structure.
109 * Called by hardware module {bas,ser,usb}_gigaset when the data in a
110 * skb has been successfully sent, for signalling completion to the LL.
112 void gigaset_skb_sent(struct bc_state
*bcs
, struct sk_buff
*skb
)
114 isdn_if
*iif
= bcs
->cs
->iif
;
115 unsigned char *ack_header
= skb_mac_header(skb
);
122 dev_warn(bcs
->cs
->dev
, "%s: skb->len==%d\n",
125 len
= ack_header
[0] + ((unsigned) ack_header
[1] << 8);
127 gig_dbg(DEBUG_MCMD
, "ACKing to LL (id: %d, ch: %d, sz: %u)",
128 bcs
->cs
->myid
, bcs
->channel
, len
);
130 response
.driver
= bcs
->cs
->myid
;
131 response
.command
= ISDN_STAT_BSENT
;
132 response
.arg
= bcs
->channel
;
133 response
.parm
.length
= len
;
134 iif
->statcallb(&response
);
137 EXPORT_SYMBOL_GPL(gigaset_skb_sent
);
140 * gigaset_skb_rcvd() - pass received skb to LL
141 * @bcs: B channel descriptor structure.
142 * @skb: received data.
144 * Called by hardware module {bas,ser,usb}_gigaset when user data has
145 * been successfully received, for passing to the LL.
146 * Warning: skb must not be accessed anymore!
148 void gigaset_skb_rcvd(struct bc_state
*bcs
, struct sk_buff
*skb
)
150 isdn_if
*iif
= bcs
->cs
->iif
;
152 iif
->rcvcallb_skb(bcs
->cs
->myid
, bcs
->channel
, skb
);
155 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd
);
158 * gigaset_isdn_rcv_err() - signal receive error
159 * @bcs: B channel descriptor structure.
161 * Called by hardware module {bas,ser,usb}_gigaset when a receive error
162 * has occurred, for signalling to the LL.
164 void gigaset_isdn_rcv_err(struct bc_state
*bcs
)
166 isdn_if
*iif
= bcs
->cs
->iif
;
169 /* if currently ignoring packets, just count down */
175 /* update statistics */
179 gig_dbg(DEBUG_CMD
, "sending L1ERR");
180 response
.driver
= bcs
->cs
->myid
;
181 response
.command
= ISDN_STAT_L1ERR
;
182 response
.arg
= bcs
->channel
;
183 response
.parm
.errcode
= ISDN_STAT_L1ERR_RECV
;
184 iif
->statcallb(&response
);
186 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err
);
188 /* This function will be called by LL to send commands
189 * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
190 * so don't put too much effort into it.
192 static int command_from_LL(isdn_ctrl
*cntrl
)
194 struct cardstate
*cs
;
195 struct bc_state
*bcs
;
202 gigaset_debugdrivers();
204 gig_dbg(DEBUG_CMD
, "driver: %d, command: %d, arg: 0x%lx",
205 cntrl
->driver
, cntrl
->command
, cntrl
->arg
);
207 cs
= gigaset_get_cs_by_id(cntrl
->driver
);
209 pr_err("%s: invalid driver ID (%d)\n", __func__
, cntrl
->driver
);
212 ch
= cntrl
->arg
& 0xff;
214 switch (cntrl
->command
) {
216 dev_warn(cs
->dev
, "ISDN_CMD_IOCTL not supported\n");
221 "ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)",
222 cntrl
->parm
.setup
.phone
, cntrl
->parm
.setup
.eazmsn
,
223 cntrl
->parm
.setup
.si1
, cntrl
->parm
.setup
.si2
);
225 if (ch
>= cs
->channels
) {
227 "ISDN_CMD_DIAL: invalid channel (%d)\n", ch
);
231 if (!gigaset_get_channel(bcs
)) {
232 dev_err(cs
->dev
, "ISDN_CMD_DIAL: channel not free\n");
236 commands
= kzalloc(AT_NUM
*(sizeof *commands
), GFP_ATOMIC
);
238 gigaset_free_channel(bcs
);
239 dev_err(cs
->dev
, "ISDN_CMD_DIAL: out of memory\n");
243 l
= 3 + strlen(cntrl
->parm
.setup
.phone
);
244 commands
[AT_DIAL
] = kmalloc(l
, GFP_ATOMIC
);
245 if (!commands
[AT_DIAL
])
247 if (cntrl
->parm
.setup
.phone
[0] == '*' &&
248 cntrl
->parm
.setup
.phone
[1] == '*') {
249 /* internal call: translate ** prefix to CTP value */
250 commands
[AT_TYPE
] = kstrdup("^SCTP=0\r", GFP_ATOMIC
);
251 if (!commands
[AT_TYPE
])
253 snprintf(commands
[AT_DIAL
], l
,
254 "D%s\r", cntrl
->parm
.setup
.phone
+2);
256 commands
[AT_TYPE
] = kstrdup("^SCTP=1\r", GFP_ATOMIC
);
257 if (!commands
[AT_TYPE
])
259 snprintf(commands
[AT_DIAL
], l
,
260 "D%s\r", cntrl
->parm
.setup
.phone
);
263 l
= strlen(cntrl
->parm
.setup
.eazmsn
);
266 commands
[AT_MSN
] = kmalloc(l
, GFP_ATOMIC
);
267 if (!commands
[AT_MSN
])
269 snprintf(commands
[AT_MSN
], l
, "^SMSN=%s\r",
270 cntrl
->parm
.setup
.eazmsn
);
273 switch (cntrl
->parm
.setup
.si1
) {
275 /* BC = 9090A3: 3.1 kHz audio, A-law */
276 commands
[AT_BC
] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC
);
277 if (!commands
[AT_BC
])
281 default: /* hope the app knows what it is doing */
282 /* BC = 8890: unrestricted digital information */
283 commands
[AT_BC
] = kstrdup("^SBC=8890\r", GFP_ATOMIC
);
284 if (!commands
[AT_BC
])
287 /* ToDo: other si1 values, inspect si2, set HLC/LLC */
289 commands
[AT_PROTO
] = kmalloc(9, GFP_ATOMIC
);
290 if (!commands
[AT_PROTO
])
292 snprintf(commands
[AT_PROTO
], 9, "^SBPR=%u\r", bcs
->proto2
);
294 commands
[AT_ISO
] = kmalloc(9, GFP_ATOMIC
);
295 if (!commands
[AT_ISO
])
297 snprintf(commands
[AT_ISO
], 9, "^SISO=%u\r",
298 (unsigned) bcs
->channel
+ 1);
300 if (!gigaset_add_event(cs
, &bcs
->at_state
, EV_DIAL
, commands
,
301 bcs
->at_state
.seq_index
, NULL
)) {
302 for (i
= 0; i
< AT_NUM
; ++i
)
305 gigaset_free_channel(bcs
);
308 gigaset_schedule_event(cs
);
310 case ISDN_CMD_ACCEPTD
:
311 gig_dbg(DEBUG_CMD
, "ISDN_CMD_ACCEPTD");
312 if (ch
>= cs
->channels
) {
314 "ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch
);
318 if (!gigaset_add_event(cs
, &bcs
->at_state
,
319 EV_ACCEPT
, NULL
, 0, NULL
))
321 gigaset_schedule_event(cs
);
324 case ISDN_CMD_HANGUP
:
325 gig_dbg(DEBUG_CMD
, "ISDN_CMD_HANGUP");
326 if (ch
>= cs
->channels
) {
328 "ISDN_CMD_HANGUP: invalid channel (%d)\n", ch
);
332 if (!gigaset_add_event(cs
, &bcs
->at_state
,
333 EV_HUP
, NULL
, 0, NULL
))
335 gigaset_schedule_event(cs
);
338 case ISDN_CMD_CLREAZ
: /* Do not signal incoming signals */
339 dev_info(cs
->dev
, "ignoring ISDN_CMD_CLREAZ\n");
341 case ISDN_CMD_SETEAZ
: /* Signal incoming calls for given MSN */
342 dev_info(cs
->dev
, "ignoring ISDN_CMD_SETEAZ (%s)\n",
345 case ISDN_CMD_SETL2
: /* Set L2 to given protocol */
346 if (ch
>= cs
->channels
) {
348 "ISDN_CMD_SETL2: invalid channel (%d)\n", ch
);
352 if (bcs
->chstate
& CHS_D_UP
) {
354 "ISDN_CMD_SETL2: channel active (%d)\n", ch
);
357 switch (cntrl
->arg
>> 8) {
358 case ISDN_PROTO_L2_HDLC
:
359 gig_dbg(DEBUG_CMD
, "ISDN_CMD_SETL2: setting L2_HDLC");
360 bcs
->proto2
= L2_HDLC
;
362 case ISDN_PROTO_L2_TRANS
:
363 gig_dbg(DEBUG_CMD
, "ISDN_CMD_SETL2: setting L2_VOICE");
364 bcs
->proto2
= L2_VOICE
;
368 "ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
373 case ISDN_CMD_SETL3
: /* Set L3 to given protocol */
374 gig_dbg(DEBUG_CMD
, "ISDN_CMD_SETL3");
375 if (ch
>= cs
->channels
) {
377 "ISDN_CMD_SETL3: invalid channel (%d)\n", ch
);
381 if (cntrl
->arg
>> 8 != ISDN_PROTO_L3_TRANS
) {
383 "ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
391 gig_dbg(DEBUG_CMD
, "unknown command %d from LL",
399 dev_err(bcs
->cs
->dev
, "out of memory\n");
400 for (i
= 0; i
< AT_NUM
; ++i
)
405 static void gigaset_i4l_cmd(struct cardstate
*cs
, int cmd
)
407 isdn_if
*iif
= cs
->iif
;
410 command
.driver
= cs
->myid
;
411 command
.command
= cmd
;
413 iif
->statcallb(&command
);
416 static void gigaset_i4l_channel_cmd(struct bc_state
*bcs
, int cmd
)
418 isdn_if
*iif
= bcs
->cs
->iif
;
421 command
.driver
= bcs
->cs
->myid
;
422 command
.command
= cmd
;
423 command
.arg
= bcs
->channel
;
424 iif
->statcallb(&command
);
428 * gigaset_isdn_icall() - signal incoming call
429 * @at_state: connection state structure.
431 * Called by main module to notify the LL that an incoming call has been
432 * received. @at_state contains the parameters of the call.
434 * Return value: call disposition (ICALL_*)
436 int gigaset_isdn_icall(struct at_state_t
*at_state
)
438 struct cardstate
*cs
= at_state
->cs
;
439 struct bc_state
*bcs
= at_state
->bcs
;
440 isdn_if
*iif
= cs
->iif
;
444 /* fill ICALL structure */
445 response
.parm
.setup
.si1
= 0; /* default: unknown */
446 response
.parm
.setup
.si2
= 0;
447 response
.parm
.setup
.screen
= 0;
448 response
.parm
.setup
.plan
= 0;
449 if (!at_state
->str_var
[STR_ZBC
]) {
450 /* no BC (internal call): assume speech, A-law */
451 response
.parm
.setup
.si1
= 1;
452 } else if (!strcmp(at_state
->str_var
[STR_ZBC
], "8890")) {
453 /* unrestricted digital information */
454 response
.parm
.setup
.si1
= 7;
455 } else if (!strcmp(at_state
->str_var
[STR_ZBC
], "8090A3")) {
457 response
.parm
.setup
.si1
= 1;
458 } else if (!strcmp(at_state
->str_var
[STR_ZBC
], "9090A3")) {
459 /* 3,1 kHz audio, A-law */
460 response
.parm
.setup
.si1
= 1;
461 response
.parm
.setup
.si2
= 2;
463 dev_warn(cs
->dev
, "RING ignored - unsupported BC %s\n",
464 at_state
->str_var
[STR_ZBC
]);
467 if (at_state
->str_var
[STR_NMBR
]) {
468 strlcpy(response
.parm
.setup
.phone
, at_state
->str_var
[STR_NMBR
],
469 sizeof response
.parm
.setup
.phone
);
471 response
.parm
.setup
.phone
[0] = 0;
472 if (at_state
->str_var
[STR_ZCPN
]) {
473 strlcpy(response
.parm
.setup
.eazmsn
, at_state
->str_var
[STR_ZCPN
],
474 sizeof response
.parm
.setup
.eazmsn
);
476 response
.parm
.setup
.eazmsn
[0] = 0;
479 dev_notice(cs
->dev
, "no channel for incoming call\n");
480 response
.command
= ISDN_STAT_ICALLW
;
483 gig_dbg(DEBUG_CMD
, "Sending ICALL");
484 response
.command
= ISDN_STAT_ICALL
;
485 response
.arg
= bcs
->channel
;
487 response
.driver
= cs
->myid
;
488 retval
= iif
->statcallb(&response
);
489 gig_dbg(DEBUG_CMD
, "Response: %d", retval
);
491 case 0: /* no takers */
493 case 1: /* alerting */
494 bcs
->chstate
|= CHS_NOTIFY_LL
;
498 case 3: /* incomplete */
500 "LL requested unsupported feature: Incomplete Number\n");
502 case 4: /* proceeding */
503 /* Gigaset will send ALERTING anyway.
504 * There doesn't seem to be a way to avoid this.
507 case 5: /* deflect */
509 "LL requested unsupported feature: Call Deflection\n");
512 dev_err(cs
->dev
, "LL error %d on ICALL\n", retval
);
518 * gigaset_isdn_connD() - signal D channel connect
519 * @bcs: B channel descriptor structure.
521 * Called by main module to notify the LL that the D channel connection has
524 void gigaset_isdn_connD(struct bc_state
*bcs
)
526 gig_dbg(DEBUG_CMD
, "sending DCONN");
527 gigaset_i4l_channel_cmd(bcs
, ISDN_STAT_DCONN
);
531 * gigaset_isdn_hupD() - signal D channel hangup
532 * @bcs: B channel descriptor structure.
534 * Called by main module to notify the LL that the D channel connection has
537 void gigaset_isdn_hupD(struct bc_state
*bcs
)
539 gig_dbg(DEBUG_CMD
, "sending DHUP");
540 gigaset_i4l_channel_cmd(bcs
, ISDN_STAT_DHUP
);
544 * gigaset_isdn_connB() - signal B channel connect
545 * @bcs: B channel descriptor structure.
547 * Called by main module to notify the LL that the B channel connection has
550 void gigaset_isdn_connB(struct bc_state
*bcs
)
552 gig_dbg(DEBUG_CMD
, "sending BCONN");
553 gigaset_i4l_channel_cmd(bcs
, ISDN_STAT_BCONN
);
557 * gigaset_isdn_hupB() - signal B channel hangup
558 * @bcs: B channel descriptor structure.
560 * Called by main module to notify the LL that the B channel connection has
563 void gigaset_isdn_hupB(struct bc_state
*bcs
)
565 gig_dbg(DEBUG_CMD
, "sending BHUP");
566 gigaset_i4l_channel_cmd(bcs
, ISDN_STAT_BHUP
);
570 * gigaset_isdn_start() - signal device availability
571 * @cs: device descriptor structure.
573 * Called by main module to notify the LL that the device is available for
576 void gigaset_isdn_start(struct cardstate
*cs
)
578 gig_dbg(DEBUG_CMD
, "sending RUN");
579 gigaset_i4l_cmd(cs
, ISDN_STAT_RUN
);
583 * gigaset_isdn_stop() - signal device unavailability
584 * @cs: device descriptor structure.
586 * Called by main module to notify the LL that the device is no longer
589 void gigaset_isdn_stop(struct cardstate
*cs
)
591 gig_dbg(DEBUG_CMD
, "sending STOP");
592 gigaset_i4l_cmd(cs
, ISDN_STAT_STOP
);
596 * gigaset_isdn_regdev() - register to LL
597 * @cs: device descriptor structure.
598 * @isdnid: device name.
600 * Return value: 1 for success, 0 for failure
602 int gigaset_isdn_regdev(struct cardstate
*cs
, const char *isdnid
)
606 pr_info("ISDN4Linux interface\n");
608 iif
= kmalloc(sizeof *iif
, GFP_KERNEL
);
610 pr_err("out of memory\n");
614 if (snprintf(iif
->id
, sizeof iif
->id
, "%s_%u", isdnid
, cs
->minor_index
)
616 pr_err("ID too long: %s\n", isdnid
);
621 iif
->owner
= THIS_MODULE
;
622 iif
->channels
= cs
->channels
;
623 iif
->maxbufsize
= MAX_BUF_SIZE
;
624 iif
->features
= ISDN_FEATURE_L2_TRANS
|
625 ISDN_FEATURE_L2_HDLC
|
627 ISDN_FEATURE_L2_X75I
|
629 ISDN_FEATURE_L3_TRANS
|
631 iif
->hl_hdrlen
= HW_HDR_LEN
; /* Area for storing ack */
632 iif
->command
= command_from_LL
;
633 iif
->writebuf_skb
= writebuf_from_LL
;
634 iif
->writecmd
= NULL
; /* Don't support isdnctrl */
635 iif
->readstat
= NULL
; /* Don't support isdnctrl */
636 iif
->rcvcallb_skb
= NULL
; /* Will be set by LL */
637 iif
->statcallb
= NULL
; /* Will be set by LL */
639 if (!register_isdn(iif
)) {
640 pr_err("register_isdn failed\n");
646 cs
->myid
= iif
->channels
; /* Set my device id */
647 cs
->hw_hdr_len
= HW_HDR_LEN
;
652 * gigaset_isdn_unregdev() - unregister device from LL
653 * @cs: device descriptor structure.
655 void gigaset_isdn_unregdev(struct cardstate
*cs
)
657 gig_dbg(DEBUG_CMD
, "sending UNLOAD");
658 gigaset_i4l_cmd(cs
, ISDN_STAT_UNLOAD
);
664 * gigaset_isdn_regdrv() - register driver to LL
666 void gigaset_isdn_regdrv(void)
672 * gigaset_isdn_unregdrv() - unregister driver from LL
674 void gigaset_isdn_unregdrv(void)