2 * Author Andreas Eversberg (jolly@eversberg.eu)
3 * Based on source code structure by
4 * Karsten Keil (keil@isdn4linux.de)
6 * This file is (c) under GNU PUBLIC LICENSE
7 * For changes and modifications please read
8 * ../../../Documentation/isdn/mISDN.cert
10 * Thanks to Karsten Keil (great drivers)
11 * Cologne Chip (great chips)
14 * Real-time tone generation
16 * Real-time cross-connection and conferrence
17 * Compensate jitter due to system load and hardware fault.
18 * All features are done in kernel space and will be realized
19 * using hardware, if available and supported by chip set.
20 * Blowfish encryption/decryption
25 * The dsp module provides layer 2 for b-channels (64kbit). It provides
26 * transparent audio forwarding with special digital signal processing:
28 * - (1) generation of tones
29 * - (2) detection of dtmf tones
30 * - (3) crossconnecting and conferences (clocking)
31 * - (4) echo generation for delay test
32 * - (5) volume control
33 * - (6) disable receive data
35 * - (8) encryption/decryption
39 * ------upper layer------
43 * +-----+-------------+-----+
50 * |+---------+| +----+----+
53 * || Tones || | DTMF |
56 * |+----+----+| +----+----+
60 * +----+----+ +----+----+
63 * |TX Volume| |RX Volume|
66 * +----+----+ +----+----+
70 * +----+-------------+----+
73 * | Pipeline Processing |
76 * +----+-------------+----+
80 * +----+----+ +----+----+
83 * | Encrypt | | Decrypt |
86 * +----+----+ +----+----+
90 * ------card layer------
93 * Above you can see the logical data flow. If software is used to do the
94 * process, it is actually the real data flow. If hardware is used, data
95 * may not flow, but hardware commands to the card, to provide the data flow
98 * NOTE: The channel must be activated in order to make dsp work, even if
99 * no data flow to the upper layer is intended. Activation can be done
100 * after and before controlling the setting using PH_CONTROL requests.
102 * DTMF: Will be detected by hardware if possible. It is done before CMX
105 * Tones: Will be generated via software if endless looped audio fifos are
106 * not supported by hardware. Tones will override all data from CMX.
107 * It is not required to join a conference to use tones at any time.
109 * CMX: Is transparent when not used. When it is used, it will do
110 * crossconnections and conferences via software if not possible through
111 * hardware. If hardware capability is available, hardware is used.
113 * Echo: Is generated by CMX and is used to check performane of hard and
116 * The CMX has special functions for conferences with one, two and more
117 * members. It will allow different types of data flow. Receive and transmit
118 * data to/form upper layer may be swithed on/off individually without loosing
119 * features of CMX, Tones and DTMF.
121 * Echo Cancellation: Sometimes we like to cancel echo from the interface.
122 * Note that a VoIP call may not have echo caused by the IP phone. The echo
123 * is generated by the telephone line connected to it. Because the delay
124 * is high, it becomes an echo. RESULT: Echo Cachelation is required if
125 * both echo AND delay is applied to an interface.
126 * Remember that software CMX always generates a more or less delay.
128 * If all used features can be realized in hardware, and if transmit and/or
129 * receive data ist disabled, the card may not send/receive any data at all.
130 * Not receiving is usefull if only announcements are played. Not sending is
131 * usefull if an answering machine records audio. Not sending and receiving is
132 * usefull during most states of the call. If supported by hardware, tones
133 * will be played without cpu load. Small PBXs and NT-Mode applications will
134 * not need expensive hardware when processing calls.
139 * When data is received from upper or lower layer (card), the complete dsp
140 * module is locked by a global lock. This lock MUST lock irq, because it
141 * must lock timer events by DSP poll timer.
142 * When data is ready to be transmitted down, the data is queued and sent
143 * outside lock and timer event.
144 * PH_CONTROL must not change any settings, join or split conference members
145 * during process of data.
149 * It works quite the same as transparent, except that HDLC data is forwarded
150 * to all other conference members if no hardware bridging is possible.
151 * Send data will be writte to sendq. Sendq will be sent if confirm is received.
152 * Conference cannot join, if one member is not hdlc.
156 #include <linux/delay.h>
157 #include <linux/mISDNif.h>
158 #include <linux/mISDNdsp.h>
159 #include <linux/module.h>
160 #include <linux/vmalloc.h>
164 static const char *mISDN_dsp_revision = "2.0";
169 static int dtmfthreshold = 100;
171 MODULE_AUTHOR("Andreas Eversberg");
172 module_param(debug, uint, S_IRUGO | S_IWUSR);
173 module_param(options, uint, S_IRUGO | S_IWUSR);
174 module_param(poll, uint, S_IRUGO | S_IWUSR);
175 module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
176 MODULE_LICENSE("GPL");
178 /*int spinnest = 0;*/
180 spinlock_t dsp_lock; /* global dsp lock */
181 struct list_head dsp_ilist;
182 struct list_head conf_ilist;
185 int dsp_poll, dsp_tics;
187 /* check if rx may be turned off or must be turned on */
189 dsp_rx_off_member(struct dsp *dsp)
191 struct mISDN_ctrl_req cq;
194 memset(&cq, 0, sizeof(cq));
196 if (!dsp->features_rx_off)
200 if (!dsp->rx_disabled)
203 else if (dsp->dtmf.software)
205 /* echo in software */
206 else if (dsp->echo && dsp->pcm_slot_tx < 0)
208 /* bridge in software */
209 else if (dsp->conf) {
210 if (dsp->conf->software)
214 if (rx_off == dsp->rx_is_off)
218 if (dsp_debug & DEBUG_DSP_CORE)
219 printk(KERN_DEBUG "%s: no peer, no rx_off\n",
223 cq.op = MISDN_CTRL_RX_OFF;
225 if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
226 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
230 dsp->rx_is_off = rx_off;
231 if (dsp_debug & DEBUG_DSP_CORE)
232 printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
233 __func__, dsp->name, rx_off);
236 dsp_rx_off(struct dsp *dsp)
238 struct dsp_conf_member *member;
240 if (dsp_options & DSP_OPT_NOHARDWARE)
245 dsp_rx_off_member(dsp);
248 /* check all members in conf */
249 list_for_each_entry(member, &dsp->conf->mlist, list) {
250 dsp_rx_off_member(member->dsp);
254 /* enable "fill empty" feature */
256 dsp_fill_empty(struct dsp *dsp)
258 struct mISDN_ctrl_req cq;
260 memset(&cq, 0, sizeof(cq));
263 if (dsp_debug & DEBUG_DSP_CORE)
264 printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
268 cq.op = MISDN_CTRL_FILL_EMPTY;
270 if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
271 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
275 if (dsp_debug & DEBUG_DSP_CORE)
276 printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
277 __func__, dsp->name);
281 dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
283 struct sk_buff *nskb;
289 if (skb->len < sizeof(int))
290 printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
291 cont = *((int *)skb->data);
292 len = skb->len - sizeof(int);
293 data = skb->data + sizeof(int);
296 case DTMF_TONE_START: /* turn on DTMF */
301 if (dsp_debug & DEBUG_DSP_CORE)
302 printk(KERN_DEBUG "%s: start dtmf\n", __func__);
303 if (len == sizeof(int)) {
304 printk(KERN_NOTICE "changing DTMF Threshold "
305 "to %d\n", *((int *)data));
306 dsp->dtmf.treshold = (*(int *)data) * 10000;
309 dsp_dtmf_goertzel_init(dsp);
311 /* check dtmf hardware */
312 dsp_dtmf_hardware(dsp);
314 case DTMF_TONE_STOP: /* turn off DTMF */
315 if (dsp_debug & DEBUG_DSP_CORE)
316 printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
317 dsp->dtmf.hardware = 0;
318 dsp->dtmf.software = 0;
320 case DSP_CONF_JOIN: /* join / update conference */
321 if (len < sizeof(int)) {
325 if (*((u32 *)data) == 0)
327 if (dsp_debug & DEBUG_DSP_CORE)
328 printk(KERN_DEBUG "%s: join conference %d\n",
329 __func__, *((u32 *)data));
330 ret = dsp_cmx_conf(dsp, *((u32 *)data));
331 /* dsp_cmx_hardware will also be called here */
333 if (dsp_debug & DEBUG_DSP_CMX)
336 case DSP_CONF_SPLIT: /* remove from conference */
338 if (dsp_debug & DEBUG_DSP_CORE)
339 printk(KERN_DEBUG "%s: release conference\n", __func__);
340 ret = dsp_cmx_conf(dsp, 0);
341 /* dsp_cmx_hardware will also be called here */
342 if (dsp_debug & DEBUG_DSP_CMX)
346 case DSP_TONE_PATT_ON: /* play tone */
351 if (len < sizeof(int)) {
355 if (dsp_debug & DEBUG_DSP_CORE)
356 printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
357 __func__, *((int *)skb->data));
358 ret = dsp_tone(dsp, *((int *)data));
360 dsp_cmx_hardware(dsp->conf, dsp);
366 case DSP_TONE_PATT_OFF: /* stop tone */
371 if (dsp_debug & DEBUG_DSP_CORE)
372 printk(KERN_DEBUG "%s: turn tone off\n", __func__);
374 dsp_cmx_hardware(dsp->conf, dsp);
376 /* reset tx buffers (user space data) */
381 case DSP_VOL_CHANGE_TX: /* change volume */
386 if (len < sizeof(int)) {
390 dsp->tx_volume = *((int *)data);
391 if (dsp_debug & DEBUG_DSP_CORE)
392 printk(KERN_DEBUG "%s: change tx vol to %d\n",
393 __func__, dsp->tx_volume);
394 dsp_cmx_hardware(dsp->conf, dsp);
395 dsp_dtmf_hardware(dsp);
398 case DSP_VOL_CHANGE_RX: /* change volume */
403 if (len < sizeof(int)) {
407 dsp->rx_volume = *((int *)data);
408 if (dsp_debug & DEBUG_DSP_CORE)
409 printk(KERN_DEBUG "%s: change rx vol to %d\n",
410 __func__, dsp->tx_volume);
411 dsp_cmx_hardware(dsp->conf, dsp);
412 dsp_dtmf_hardware(dsp);
415 case DSP_ECHO_ON: /* enable echo */
416 dsp->echo = 1; /* soft echo */
417 if (dsp_debug & DEBUG_DSP_CORE)
418 printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
419 dsp_cmx_hardware(dsp->conf, dsp);
421 if (dsp_debug & DEBUG_DSP_CMX)
424 case DSP_ECHO_OFF: /* disable echo */
426 if (dsp_debug & DEBUG_DSP_CORE)
427 printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
428 dsp_cmx_hardware(dsp->conf, dsp);
430 if (dsp_debug & DEBUG_DSP_CMX)
433 case DSP_RECEIVE_ON: /* enable receive to user space */
434 if (dsp_debug & DEBUG_DSP_CORE)
435 printk(KERN_DEBUG "%s: enable receive to user "
436 "space\n", __func__);
437 dsp->rx_disabled = 0;
440 case DSP_RECEIVE_OFF: /* disable receive to user space */
441 if (dsp_debug & DEBUG_DSP_CORE)
442 printk(KERN_DEBUG "%s: disable receive to "
443 "user space\n", __func__);
444 dsp->rx_disabled = 1;
447 case DSP_MIX_ON: /* enable mixing of tx data */
452 if (dsp_debug & DEBUG_DSP_CORE)
453 printk(KERN_DEBUG "%s: enable mixing of "
454 "tx-data with conf mebers\n", __func__);
456 dsp_cmx_hardware(dsp->conf, dsp);
458 if (dsp_debug & DEBUG_DSP_CMX)
461 case DSP_MIX_OFF: /* disable mixing of tx data */
466 if (dsp_debug & DEBUG_DSP_CORE)
467 printk(KERN_DEBUG "%s: disable mixing of "
468 "tx-data with conf mebers\n", __func__);
470 dsp_cmx_hardware(dsp->conf, dsp);
472 if (dsp_debug & DEBUG_DSP_CMX)
475 case DSP_TXDATA_ON: /* enable txdata */
477 if (dsp_debug & DEBUG_DSP_CORE)
478 printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
479 dsp_cmx_hardware(dsp->conf, dsp);
481 if (dsp_debug & DEBUG_DSP_CMX)
484 case DSP_TXDATA_OFF: /* disable txdata */
486 if (dsp_debug & DEBUG_DSP_CORE)
487 printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
488 dsp_cmx_hardware(dsp->conf, dsp);
490 if (dsp_debug & DEBUG_DSP_CMX)
493 case DSP_DELAY: /* use delay algorithm instead of dynamic
499 if (len < sizeof(int)) {
503 dsp->cmx_delay = (*((int *)data)) << 3;
504 /* miliseconds to samples */
505 if (dsp->cmx_delay >= (CMX_BUFF_HALF>>1))
506 /* clip to half of maximum usable buffer
507 (half of half buffer) */
508 dsp->cmx_delay = (CMX_BUFF_HALF>>1) - 1;
509 if (dsp_debug & DEBUG_DSP_CORE)
510 printk(KERN_DEBUG "%s: use delay algorithm to "
511 "compensate jitter (%d samples)\n",
512 __func__, dsp->cmx_delay);
514 case DSP_JITTER: /* use dynamic jitter algorithm instead of
521 if (dsp_debug & DEBUG_DSP_CORE)
522 printk(KERN_DEBUG "%s: use jitter algorithm to "
523 "compensate jitter\n", __func__);
525 case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
530 dsp->tx_dejitter = 1;
531 if (dsp_debug & DEBUG_DSP_CORE)
532 printk(KERN_DEBUG "%s: use dejitter on TX "
533 "buffer\n", __func__);
535 case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
540 dsp->tx_dejitter = 0;
541 if (dsp_debug & DEBUG_DSP_CORE)
542 printk(KERN_DEBUG "%s: use TX buffer without "
543 "dejittering\n", __func__);
545 case DSP_PIPELINE_CFG:
550 if (len > 0 && ((char *)data)[len - 1]) {
551 printk(KERN_DEBUG "%s: pipeline config string "
552 "is not NULL terminated!\n", __func__);
555 dsp->pipeline.inuse = 1;
556 dsp_cmx_hardware(dsp->conf, dsp);
557 ret = dsp_pipeline_build(&dsp->pipeline,
558 len > 0 ? (char *)data : NULL);
559 dsp_cmx_hardware(dsp->conf, dsp);
563 case DSP_BF_ENABLE_KEY: /* turn blowfish on */
568 if (len < 4 || len > 56) {
572 if (dsp_debug & DEBUG_DSP_CORE)
573 printk(KERN_DEBUG "%s: turn blowfish on (key "
574 "not shown)\n", __func__);
575 ret = dsp_bf_init(dsp, (u8 *)data, len);
578 cont = DSP_BF_ACCEPT;
580 cont = DSP_BF_REJECT;
581 /* send indication if it worked to set it */
582 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
583 sizeof(int), &cont, GFP_ATOMIC);
586 if (dsp->up->send(dsp->up, nskb))
592 dsp_cmx_hardware(dsp->conf, dsp);
593 dsp_dtmf_hardware(dsp);
597 case DSP_BF_DISABLE: /* turn blowfish off */
602 if (dsp_debug & DEBUG_DSP_CORE)
603 printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
605 dsp_cmx_hardware(dsp->conf, dsp);
606 dsp_dtmf_hardware(dsp);
610 if (dsp_debug & DEBUG_DSP_CORE)
611 printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
619 get_features(struct mISDNchannel *ch)
621 struct dsp *dsp = container_of(ch, struct dsp, ch);
622 struct mISDN_ctrl_req cq;
625 if (dsp_debug & DEBUG_DSP_CORE)
626 printk(KERN_DEBUG "%s: no peer, no features\n",
630 memset(&cq, 0, sizeof(cq));
631 cq.op = MISDN_CTRL_GETOP;
632 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
633 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
637 if (cq.op & MISDN_CTRL_RX_OFF)
638 dsp->features_rx_off = 1;
639 if (cq.op & MISDN_CTRL_FILL_EMPTY)
640 dsp->features_fill_empty = 1;
641 if (dsp_options & DSP_OPT_NOHARDWARE)
643 if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
644 cq.op = MISDN_CTRL_HW_FEATURES;
645 *((u_long *)&cq.p1) = (u_long)&dsp->features;
646 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
647 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
651 if (dsp_debug & DEBUG_DSP_CORE)
652 printk(KERN_DEBUG "%s: features not supported for %s\n",
653 __func__, dsp->name);
657 dsp_function(struct mISDNchannel *ch, struct sk_buff *skb)
659 struct dsp *dsp = container_of(ch, struct dsp, ch);
660 struct mISDNhead *hh;
666 hh = mISDN_HEAD_P(skb);
670 dsp->data_pending = 0;
671 /* trigger next hdlc frame, if any */
673 spin_lock_irqsave(&dsp_lock, flags);
675 schedule_work(&dsp->workq);
676 spin_unlock_irqrestore(&dsp_lock, flags);
685 if (dsp->rx_is_off) {
686 if (dsp_debug & DEBUG_DSP_CORE)
687 printk(KERN_DEBUG "%s: rx-data during rx_off"
689 __func__, dsp->name);
693 spin_lock_irqsave(&dsp_lock, flags);
694 dsp_cmx_hdlc(dsp, skb);
695 spin_unlock_irqrestore(&dsp_lock, flags);
696 if (dsp->rx_disabled) {
697 /* if receive is not allowed */
700 hh->prim = DL_DATA_IND;
702 return dsp->up->send(dsp->up, skb);
706 /* decrypt if enabled */
708 dsp_bf_decrypt(dsp, skb->data, skb->len);
710 if (dsp->pipeline.inuse)
711 dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
713 /* change volume if requested */
715 dsp_change_volume(skb, dsp->rx_volume);
717 /* check if dtmf soft decoding is turned on */
718 if (dsp->dtmf.software) {
719 digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
720 skb->len, (dsp_options&DSP_OPT_ULAW)?1:0);
722 struct sk_buff *nskb;
723 if (dsp_debug & DEBUG_DSP_DTMF)
724 printk(KERN_DEBUG "%s: digit"
725 "(%c) to layer %s\n",
726 __func__, *digits, dsp->name);
727 cont = DTMF_TONE_VAL | *digits;
728 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
729 MISDN_ID_ANY, sizeof(int), &cont,
742 /* we need to process receive data if software */
743 spin_lock_irqsave(&dsp_lock, flags);
744 if (dsp->pcm_slot_tx < 0 && dsp->pcm_slot_rx < 0) {
745 /* process data from card at cmx */
746 dsp_cmx_receive(dsp, skb);
748 spin_unlock_irqrestore(&dsp_lock, flags);
750 if (dsp->rx_disabled) {
751 /* if receive is not allowed */
754 hh->prim = DL_DATA_IND;
756 return dsp->up->send(dsp->up, skb);
758 case (PH_CONTROL_IND):
759 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
760 printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
761 "received: %x (len %d) %s\n", __func__,
762 hh->id, skb->len, dsp->name);
764 case (DTMF_HFC_COEF): /* getting coefficients */
765 if (!dsp->dtmf.hardware) {
766 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
767 printk(KERN_DEBUG "%s: ignoring DTMF "
768 "coefficients from HFC\n",
772 digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
776 struct sk_buff *nskb;
777 if (dsp_debug & DEBUG_DSP_DTMF)
778 printk(KERN_DEBUG "%s: digit"
779 "(%c) to layer %s\n",
780 __func__, *digits, dsp->name);
781 k = *digits | DTMF_TONE_VAL;
782 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
783 MISDN_ID_ANY, sizeof(int), &k,
796 case (HFC_VOL_CHANGE_TX): /* change volume */
797 if (skb->len != sizeof(int)) {
801 spin_lock_irqsave(&dsp_lock, flags);
802 dsp->tx_volume = *((int *)skb->data);
803 if (dsp_debug & DEBUG_DSP_CORE)
804 printk(KERN_DEBUG "%s: change tx volume to "
805 "%d\n", __func__, dsp->tx_volume);
806 dsp_cmx_hardware(dsp->conf, dsp);
807 dsp_dtmf_hardware(dsp);
809 spin_unlock_irqrestore(&dsp_lock, flags);
812 if (dsp_debug & DEBUG_DSP_CORE)
813 printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
814 "%s\n", __func__, hh->id, dsp->name);
818 case (PH_ACTIVATE_IND):
819 case (PH_ACTIVATE_CNF):
820 if (dsp_debug & DEBUG_DSP_CORE)
821 printk(KERN_DEBUG "%s: b_channel is now active %s\n",
822 __func__, dsp->name);
823 /* bchannel now active */
824 spin_lock_irqsave(&dsp_lock, flags);
826 dsp->data_pending = 0;
828 /* rx_W and rx_R will be adjusted on first frame */
831 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
832 dsp_cmx_hardware(dsp->conf, dsp);
833 dsp_dtmf_hardware(dsp);
835 spin_unlock_irqrestore(&dsp_lock, flags);
836 if (dsp_debug & DEBUG_DSP_CORE)
837 printk(KERN_DEBUG "%s: done with activation, sending "
838 "confirm to user space. %s\n", __func__,
840 /* send activation to upper layer */
841 hh->prim = DL_ESTABLISH_CNF;
843 return dsp->up->send(dsp->up, skb);
845 case (PH_DEACTIVATE_IND):
846 case (PH_DEACTIVATE_CNF):
847 if (dsp_debug & DEBUG_DSP_CORE)
848 printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
849 __func__, dsp->name);
850 /* bchannel now inactive */
851 spin_lock_irqsave(&dsp_lock, flags);
853 dsp->data_pending = 0;
854 dsp_cmx_hardware(dsp->conf, dsp);
856 spin_unlock_irqrestore(&dsp_lock, flags);
857 hh->prim = DL_RELEASE_CNF;
859 return dsp->up->send(dsp->up, skb);
870 if (!dsp->b_active) {
874 hh->prim = PH_DATA_REQ;
875 spin_lock_irqsave(&dsp_lock, flags);
876 skb_queue_tail(&dsp->sendq, skb);
877 schedule_work(&dsp->workq);
878 spin_unlock_irqrestore(&dsp_lock, flags);
881 /* send data to tx-buffer (if no tone is played) */
882 if (!dsp->tone.tone) {
883 spin_lock_irqsave(&dsp_lock, flags);
884 dsp_cmx_transmit(dsp, skb);
885 spin_unlock_irqrestore(&dsp_lock, flags);
888 case (PH_CONTROL_REQ):
889 spin_lock_irqsave(&dsp_lock, flags);
890 ret = dsp_control_req(dsp, hh, skb);
891 spin_unlock_irqrestore(&dsp_lock, flags);
893 case (DL_ESTABLISH_REQ):
894 case (PH_ACTIVATE_REQ):
895 if (dsp_debug & DEBUG_DSP_CORE)
896 printk(KERN_DEBUG "%s: activating b_channel %s\n",
897 __func__, dsp->name);
898 if (dsp->dtmf.hardware || dsp->dtmf.software)
899 dsp_dtmf_goertzel_init(dsp);
901 /* enable fill_empty feature */
902 if (dsp->features_fill_empty)
904 /* send ph_activate */
905 hh->prim = PH_ACTIVATE_REQ;
907 return ch->recv(ch->peer, skb);
909 case (DL_RELEASE_REQ):
910 case (PH_DEACTIVATE_REQ):
911 if (dsp_debug & DEBUG_DSP_CORE)
912 printk(KERN_DEBUG "%s: releasing b_channel %s\n",
913 __func__, dsp->name);
914 spin_lock_irqsave(&dsp_lock, flags);
916 dsp->tone.hardware = 0;
917 dsp->tone.software = 0;
918 if (timer_pending(&dsp->tone.tl))
919 del_timer(&dsp->tone.tl);
921 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
923 skb_queue_purge(&dsp->sendq);
924 spin_unlock_irqrestore(&dsp_lock, flags);
925 hh->prim = PH_DEACTIVATE_REQ;
927 return ch->recv(ch->peer, skb);
930 if (dsp_debug & DEBUG_DSP_CORE)
931 printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
932 __func__, hh->prim, dsp->name);
941 dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
943 struct dsp *dsp = container_of(ch, struct dsp, ch);
947 if (debug & DEBUG_DSP_CTRL)
948 printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
955 dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
957 /* wait until workqueue has finished,
958 * must lock here, or we may hit send-process currently
960 spin_lock_irqsave(&dsp_lock, flags);
962 spin_unlock_irqrestore(&dsp_lock, flags);
963 /* MUST not be locked, because it waits until queue is done. */
964 cancel_work_sync(&dsp->workq);
965 spin_lock_irqsave(&dsp_lock, flags);
966 if (timer_pending(&dsp->tone.tl))
967 del_timer(&dsp->tone.tl);
968 skb_queue_purge(&dsp->sendq);
969 if (dsp_debug & DEBUG_DSP_CTRL)
970 printk(KERN_DEBUG "%s: releasing member %s\n",
971 __func__, dsp->name);
973 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
975 dsp_pipeline_destroy(&dsp->pipeline);
977 if (dsp_debug & DEBUG_DSP_CTRL)
978 printk(KERN_DEBUG "%s: remove & destroy object %s\n",
979 __func__, dsp->name);
980 list_del(&dsp->list);
981 spin_unlock_irqrestore(&dsp_lock, flags);
983 if (dsp_debug & DEBUG_DSP_CTRL)
984 printk(KERN_DEBUG "%s: dsp instance released\n",
987 module_put(THIS_MODULE);
994 dsp_send_bh(struct work_struct *work)
996 struct dsp *dsp = container_of(work, struct dsp, workq);
998 struct mISDNhead *hh;
1000 if (dsp->hdlc && dsp->data_pending)
1001 return; /* wait until data has been acknowledged */
1003 /* send queued data */
1004 while ((skb = skb_dequeue(&dsp->sendq))) {
1005 /* in locked date, we must have still data in queue */
1006 if (dsp->data_pending) {
1007 if (dsp_debug & DEBUG_DSP_CORE)
1008 printk(KERN_DEBUG "%s: fifo full %s, this is "
1009 "no bug!\n", __func__, dsp->name);
1010 /* flush transparent data, if not acked */
1014 hh = mISDN_HEAD_P(skb);
1015 if (hh->prim == DL_DATA_REQ) {
1016 /* send packet up */
1018 if (dsp->up->send(dsp->up, skb))
1023 /* send packet down */
1025 dsp->data_pending = 1;
1026 if (dsp->ch.recv(dsp->ch.peer, skb)) {
1028 dsp->data_pending = 0;
1037 dspcreate(struct channel_req *crq)
1042 if (crq->protocol != ISDN_P_B_L2DSP
1043 && crq->protocol != ISDN_P_B_L2DSPHDLC)
1044 return -EPROTONOSUPPORT;
1045 ndsp = vmalloc(sizeof(struct dsp));
1047 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1050 memset(ndsp, 0, sizeof(struct dsp));
1051 if (dsp_debug & DEBUG_DSP_CTRL)
1052 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1054 /* default enabled */
1055 INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1056 skb_queue_head_init(&ndsp->sendq);
1057 ndsp->ch.send = dsp_function;
1058 ndsp->ch.ctrl = dsp_ctrl;
1060 crq->ch = &ndsp->ch;
1061 if (crq->protocol == ISDN_P_B_L2DSP) {
1062 crq->protocol = ISDN_P_B_RAW;
1065 crq->protocol = ISDN_P_B_HDLC;
1068 if (!try_module_get(THIS_MODULE))
1069 printk(KERN_WARNING "%s:cannot get module\n",
1072 sprintf(ndsp->name, "DSP_C%x(0x%p)",
1073 ndsp->up->st->dev->id + 1, ndsp);
1074 /* set frame size to start */
1075 ndsp->features.hfc_id = -1; /* current PCM id */
1076 ndsp->features.pcm_id = -1; /* current PCM id */
1077 ndsp->pcm_slot_rx = -1; /* current CPM slot */
1078 ndsp->pcm_slot_tx = -1;
1079 ndsp->pcm_bank_rx = -1;
1080 ndsp->pcm_bank_tx = -1;
1081 ndsp->hfc_conf = -1; /* current conference number */
1082 /* set tone timer */
1083 ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1084 ndsp->tone.tl.data = (long) ndsp;
1085 init_timer(&ndsp->tone.tl);
1087 if (dtmfthreshold < 20 || dtmfthreshold > 500)
1088 dtmfthreshold = 200;
1089 ndsp->dtmf.treshold = dtmfthreshold*10000;
1091 /* init pipeline append to list */
1092 spin_lock_irqsave(&dsp_lock, flags);
1093 dsp_pipeline_init(&ndsp->pipeline);
1094 list_add_tail(&ndsp->list, &dsp_ilist);
1095 spin_unlock_irqrestore(&dsp_lock, flags);
1101 static struct Bprotocol DSP = {
1102 .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1103 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1108 static int dsp_init(void)
1113 printk(KERN_INFO "DSP modul %s\n", mISDN_dsp_revision);
1115 dsp_options = options;
1118 /* set packet size */
1121 if (dsp_poll > MAX_POLL) {
1122 printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1123 "maximum.\n", __func__, poll, MAX_POLL);
1128 printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1129 "minimum.\n", __func__, dsp_poll);
1133 dsp_tics = poll * HZ / 8000;
1134 if (dsp_tics * 8000 != poll * HZ) {
1135 printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1136 "samples (0,125 ms). It is not a multiple of "
1137 "%d HZ.\n", poll, HZ);
1143 while (poll <= MAX_POLL) {
1144 tics = poll * HZ / 8000;
1145 if (tics * 8000 == poll * HZ) {
1154 if (dsp_poll == 0) {
1155 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1156 "clock that equals exactly the duration of 8-256 "
1157 "samples. (Choose kernel clock speed like 100, 250, "
1162 printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1163 "%d jiffies.\n", dsp_poll, dsp_tics);
1165 spin_lock_init(&dsp_lock);
1166 INIT_LIST_HEAD(&dsp_ilist);
1167 INIT_LIST_HEAD(&conf_ilist);
1169 /* init conversion tables */
1170 dsp_audio_generate_law_tables();
1171 dsp_silence = (dsp_options&DSP_OPT_ULAW)?0xff:0x2a;
1172 dsp_audio_law_to_s32 = (dsp_options&DSP_OPT_ULAW)?dsp_audio_ulaw_to_s32:
1173 dsp_audio_alaw_to_s32;
1174 dsp_audio_generate_s2law_table();
1175 dsp_audio_generate_seven();
1176 dsp_audio_generate_mix_table();
1177 if (dsp_options & DSP_OPT_ULAW)
1178 dsp_audio_generate_ulaw_samples();
1179 dsp_audio_generate_volume_changes();
1181 err = dsp_pipeline_module_init();
1183 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
1184 "error(%d)\n", err);
1188 err = mISDN_register_Bprotocol(&DSP);
1190 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1194 /* set sample timer */
1195 dsp_spl_tl.function = (void *)dsp_cmx_send;
1196 dsp_spl_tl.data = 0;
1197 init_timer(&dsp_spl_tl);
1198 dsp_spl_tl.expires = jiffies + dsp_tics;
1199 dsp_spl_jiffies = dsp_spl_tl.expires;
1200 add_timer(&dsp_spl_tl);
1206 static void dsp_cleanup(void)
1208 mISDN_unregister_Bprotocol(&DSP);
1210 if (timer_pending(&dsp_spl_tl))
1211 del_timer(&dsp_spl_tl);
1213 if (!list_empty(&dsp_ilist)) {
1214 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1217 if (!list_empty(&conf_ilist)) {
1218 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1219 "all memory freed.\n");
1222 dsp_pipeline_module_exit();
1225 module_init(dsp_init);
1226 module_exit(dsp_cleanup);