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 if (dsp_debug & DEBUG_DSP_CORE)
305 printk(KERN_NOTICE "changing DTMF Threshold "
306 "to %d\n", *((int *)data));
307 dsp->dtmf.treshold = (*(int *)data) * 10000;
310 dsp_dtmf_goertzel_init(dsp);
312 /* check dtmf hardware */
313 dsp_dtmf_hardware(dsp);
316 case DTMF_TONE_STOP: /* turn off DTMF */
317 if (dsp_debug & DEBUG_DSP_CORE)
318 printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
319 dsp->dtmf.hardware = 0;
320 dsp->dtmf.software = 0;
322 case DSP_CONF_JOIN: /* join / update conference */
323 if (len < sizeof(int)) {
327 if (*((u32 *)data) == 0)
329 if (dsp_debug & DEBUG_DSP_CORE)
330 printk(KERN_DEBUG "%s: join conference %d\n",
331 __func__, *((u32 *)data));
332 ret = dsp_cmx_conf(dsp, *((u32 *)data));
333 /* dsp_cmx_hardware will also be called here */
335 if (dsp_debug & DEBUG_DSP_CMX)
338 case DSP_CONF_SPLIT: /* remove from conference */
340 if (dsp_debug & DEBUG_DSP_CORE)
341 printk(KERN_DEBUG "%s: release conference\n", __func__);
342 ret = dsp_cmx_conf(dsp, 0);
343 /* dsp_cmx_hardware will also be called here */
344 if (dsp_debug & DEBUG_DSP_CMX)
348 case DSP_TONE_PATT_ON: /* play tone */
353 if (len < sizeof(int)) {
357 if (dsp_debug & DEBUG_DSP_CORE)
358 printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
359 __func__, *((int *)skb->data));
360 ret = dsp_tone(dsp, *((int *)data));
362 dsp_cmx_hardware(dsp->conf, dsp);
368 case DSP_TONE_PATT_OFF: /* stop tone */
373 if (dsp_debug & DEBUG_DSP_CORE)
374 printk(KERN_DEBUG "%s: turn tone off\n", __func__);
376 dsp_cmx_hardware(dsp->conf, dsp);
378 /* reset tx buffers (user space data) */
383 case DSP_VOL_CHANGE_TX: /* change volume */
388 if (len < sizeof(int)) {
392 dsp->tx_volume = *((int *)data);
393 if (dsp_debug & DEBUG_DSP_CORE)
394 printk(KERN_DEBUG "%s: change tx vol to %d\n",
395 __func__, dsp->tx_volume);
396 dsp_cmx_hardware(dsp->conf, dsp);
397 dsp_dtmf_hardware(dsp);
400 case DSP_VOL_CHANGE_RX: /* change volume */
405 if (len < sizeof(int)) {
409 dsp->rx_volume = *((int *)data);
410 if (dsp_debug & DEBUG_DSP_CORE)
411 printk(KERN_DEBUG "%s: change rx vol to %d\n",
412 __func__, dsp->tx_volume);
413 dsp_cmx_hardware(dsp->conf, dsp);
414 dsp_dtmf_hardware(dsp);
417 case DSP_ECHO_ON: /* enable echo */
418 dsp->echo = 1; /* soft echo */
419 if (dsp_debug & DEBUG_DSP_CORE)
420 printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
421 dsp_cmx_hardware(dsp->conf, dsp);
423 if (dsp_debug & DEBUG_DSP_CMX)
426 case DSP_ECHO_OFF: /* disable echo */
428 if (dsp_debug & DEBUG_DSP_CORE)
429 printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
430 dsp_cmx_hardware(dsp->conf, dsp);
432 if (dsp_debug & DEBUG_DSP_CMX)
435 case DSP_RECEIVE_ON: /* enable receive to user space */
436 if (dsp_debug & DEBUG_DSP_CORE)
437 printk(KERN_DEBUG "%s: enable receive to user "
438 "space\n", __func__);
439 dsp->rx_disabled = 0;
442 case DSP_RECEIVE_OFF: /* disable receive to user space */
443 if (dsp_debug & DEBUG_DSP_CORE)
444 printk(KERN_DEBUG "%s: disable receive to "
445 "user space\n", __func__);
446 dsp->rx_disabled = 1;
449 case DSP_MIX_ON: /* enable mixing of tx data */
454 if (dsp_debug & DEBUG_DSP_CORE)
455 printk(KERN_DEBUG "%s: enable mixing of "
456 "tx-data with conf mebers\n", __func__);
458 dsp_cmx_hardware(dsp->conf, dsp);
460 if (dsp_debug & DEBUG_DSP_CMX)
463 case DSP_MIX_OFF: /* disable mixing of tx data */
468 if (dsp_debug & DEBUG_DSP_CORE)
469 printk(KERN_DEBUG "%s: disable mixing of "
470 "tx-data with conf mebers\n", __func__);
472 dsp_cmx_hardware(dsp->conf, dsp);
474 if (dsp_debug & DEBUG_DSP_CMX)
477 case DSP_TXDATA_ON: /* enable txdata */
479 if (dsp_debug & DEBUG_DSP_CORE)
480 printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
481 dsp_cmx_hardware(dsp->conf, dsp);
483 if (dsp_debug & DEBUG_DSP_CMX)
486 case DSP_TXDATA_OFF: /* disable txdata */
488 if (dsp_debug & DEBUG_DSP_CORE)
489 printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
490 dsp_cmx_hardware(dsp->conf, dsp);
492 if (dsp_debug & DEBUG_DSP_CMX)
495 case DSP_DELAY: /* use delay algorithm instead of dynamic
501 if (len < sizeof(int)) {
505 dsp->cmx_delay = (*((int *)data)) << 3;
506 /* miliseconds to samples */
507 if (dsp->cmx_delay >= (CMX_BUFF_HALF>>1))
508 /* clip to half of maximum usable buffer
509 (half of half buffer) */
510 dsp->cmx_delay = (CMX_BUFF_HALF>>1) - 1;
511 if (dsp_debug & DEBUG_DSP_CORE)
512 printk(KERN_DEBUG "%s: use delay algorithm to "
513 "compensate jitter (%d samples)\n",
514 __func__, dsp->cmx_delay);
516 case DSP_JITTER: /* use dynamic jitter algorithm instead of
523 if (dsp_debug & DEBUG_DSP_CORE)
524 printk(KERN_DEBUG "%s: use jitter algorithm to "
525 "compensate jitter\n", __func__);
527 case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
532 dsp->tx_dejitter = 1;
533 if (dsp_debug & DEBUG_DSP_CORE)
534 printk(KERN_DEBUG "%s: use dejitter on TX "
535 "buffer\n", __func__);
537 case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
542 dsp->tx_dejitter = 0;
543 if (dsp_debug & DEBUG_DSP_CORE)
544 printk(KERN_DEBUG "%s: use TX buffer without "
545 "dejittering\n", __func__);
547 case DSP_PIPELINE_CFG:
552 if (len > 0 && ((char *)data)[len - 1]) {
553 printk(KERN_DEBUG "%s: pipeline config string "
554 "is not NULL terminated!\n", __func__);
557 dsp->pipeline.inuse = 1;
558 dsp_cmx_hardware(dsp->conf, dsp);
559 ret = dsp_pipeline_build(&dsp->pipeline,
560 len > 0 ? (char *)data : NULL);
561 dsp_cmx_hardware(dsp->conf, dsp);
565 case DSP_BF_ENABLE_KEY: /* turn blowfish on */
570 if (len < 4 || len > 56) {
574 if (dsp_debug & DEBUG_DSP_CORE)
575 printk(KERN_DEBUG "%s: turn blowfish on (key "
576 "not shown)\n", __func__);
577 ret = dsp_bf_init(dsp, (u8 *)data, len);
580 cont = DSP_BF_ACCEPT;
582 cont = DSP_BF_REJECT;
583 /* send indication if it worked to set it */
584 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
585 sizeof(int), &cont, GFP_ATOMIC);
588 if (dsp->up->send(dsp->up, nskb))
594 dsp_cmx_hardware(dsp->conf, dsp);
595 dsp_dtmf_hardware(dsp);
599 case DSP_BF_DISABLE: /* turn blowfish off */
604 if (dsp_debug & DEBUG_DSP_CORE)
605 printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
607 dsp_cmx_hardware(dsp->conf, dsp);
608 dsp_dtmf_hardware(dsp);
612 if (dsp_debug & DEBUG_DSP_CORE)
613 printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
621 get_features(struct mISDNchannel *ch)
623 struct dsp *dsp = container_of(ch, struct dsp, ch);
624 struct mISDN_ctrl_req cq;
627 if (dsp_debug & DEBUG_DSP_CORE)
628 printk(KERN_DEBUG "%s: no peer, no features\n",
632 memset(&cq, 0, sizeof(cq));
633 cq.op = MISDN_CTRL_GETOP;
634 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
635 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
639 if (cq.op & MISDN_CTRL_RX_OFF)
640 dsp->features_rx_off = 1;
641 if (cq.op & MISDN_CTRL_FILL_EMPTY)
642 dsp->features_fill_empty = 1;
643 if (dsp_options & DSP_OPT_NOHARDWARE)
645 if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
646 cq.op = MISDN_CTRL_HW_FEATURES;
647 *((u_long *)&cq.p1) = (u_long)&dsp->features;
648 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
649 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
653 if (dsp_debug & DEBUG_DSP_CORE)
654 printk(KERN_DEBUG "%s: features not supported for %s\n",
655 __func__, dsp->name);
659 dsp_function(struct mISDNchannel *ch, struct sk_buff *skb)
661 struct dsp *dsp = container_of(ch, struct dsp, ch);
662 struct mISDNhead *hh;
667 hh = mISDN_HEAD_P(skb);
671 dsp->data_pending = 0;
672 /* trigger next hdlc frame, if any */
674 spin_lock_irqsave(&dsp_lock, flags);
676 schedule_work(&dsp->workq);
677 spin_unlock_irqrestore(&dsp_lock, flags);
686 if (dsp->rx_is_off) {
687 if (dsp_debug & DEBUG_DSP_CORE)
688 printk(KERN_DEBUG "%s: rx-data during rx_off"
690 __func__, dsp->name);
694 spin_lock_irqsave(&dsp_lock, flags);
695 dsp_cmx_hdlc(dsp, skb);
696 spin_unlock_irqrestore(&dsp_lock, flags);
697 if (dsp->rx_disabled) {
698 /* if receive is not allowed */
701 hh->prim = DL_DATA_IND;
703 return dsp->up->send(dsp->up, skb);
707 spin_lock_irqsave(&dsp_lock, flags);
709 /* decrypt if enabled */
711 dsp_bf_decrypt(dsp, skb->data, skb->len);
713 if (dsp->pipeline.inuse)
714 dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
716 /* change volume if requested */
718 dsp_change_volume(skb, dsp->rx_volume);
719 /* check if dtmf soft decoding is turned on */
720 if (dsp->dtmf.software) {
721 digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
722 skb->len, (dsp_options&DSP_OPT_ULAW)?1:0);
724 /* we need to process receive data if software */
725 if (dsp->pcm_slot_tx < 0 && dsp->pcm_slot_rx < 0) {
726 /* process data from card at cmx */
727 dsp_cmx_receive(dsp, skb);
730 spin_unlock_irqrestore(&dsp_lock, flags);
732 /* send dtmf result, if any */
736 struct sk_buff *nskb;
737 if (dsp_debug & DEBUG_DSP_DTMF)
738 printk(KERN_DEBUG "%s: digit"
739 "(%c) to layer %s\n",
740 __func__, *digits, dsp->name);
741 k = *digits | DTMF_TONE_VAL;
742 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
743 MISDN_ID_ANY, sizeof(int), &k,
756 if (dsp->rx_disabled) {
757 /* if receive is not allowed */
760 hh->prim = DL_DATA_IND;
762 return dsp->up->send(dsp->up, skb);
764 case (PH_CONTROL_IND):
765 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
766 printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
767 "received: %x (len %d) %s\n", __func__,
768 hh->id, skb->len, dsp->name);
770 case (DTMF_HFC_COEF): /* getting coefficients */
771 if (!dsp->dtmf.hardware) {
772 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
773 printk(KERN_DEBUG "%s: ignoring DTMF "
774 "coefficients from HFC\n",
778 digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
782 struct sk_buff *nskb;
783 if (dsp_debug & DEBUG_DSP_DTMF)
784 printk(KERN_DEBUG "%s: digit"
785 "(%c) to layer %s\n",
786 __func__, *digits, dsp->name);
787 k = *digits | DTMF_TONE_VAL;
788 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
789 MISDN_ID_ANY, sizeof(int), &k,
802 case (HFC_VOL_CHANGE_TX): /* change volume */
803 if (skb->len != sizeof(int)) {
807 spin_lock_irqsave(&dsp_lock, flags);
808 dsp->tx_volume = *((int *)skb->data);
809 if (dsp_debug & DEBUG_DSP_CORE)
810 printk(KERN_DEBUG "%s: change tx volume to "
811 "%d\n", __func__, dsp->tx_volume);
812 dsp_cmx_hardware(dsp->conf, dsp);
813 dsp_dtmf_hardware(dsp);
815 spin_unlock_irqrestore(&dsp_lock, flags);
818 if (dsp_debug & DEBUG_DSP_CORE)
819 printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
820 "%s\n", __func__, hh->id, dsp->name);
824 case (PH_ACTIVATE_IND):
825 case (PH_ACTIVATE_CNF):
826 if (dsp_debug & DEBUG_DSP_CORE)
827 printk(KERN_DEBUG "%s: b_channel is now active %s\n",
828 __func__, dsp->name);
829 /* bchannel now active */
830 spin_lock_irqsave(&dsp_lock, flags);
832 dsp->data_pending = 0;
834 /* rx_W and rx_R will be adjusted on first frame */
837 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
838 dsp_cmx_hardware(dsp->conf, dsp);
839 dsp_dtmf_hardware(dsp);
841 spin_unlock_irqrestore(&dsp_lock, flags);
842 if (dsp_debug & DEBUG_DSP_CORE)
843 printk(KERN_DEBUG "%s: done with activation, sending "
844 "confirm to user space. %s\n", __func__,
846 /* send activation to upper layer */
847 hh->prim = DL_ESTABLISH_CNF;
849 return dsp->up->send(dsp->up, skb);
851 case (PH_DEACTIVATE_IND):
852 case (PH_DEACTIVATE_CNF):
853 if (dsp_debug & DEBUG_DSP_CORE)
854 printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
855 __func__, dsp->name);
856 /* bchannel now inactive */
857 spin_lock_irqsave(&dsp_lock, flags);
859 dsp->data_pending = 0;
860 dsp_cmx_hardware(dsp->conf, dsp);
862 spin_unlock_irqrestore(&dsp_lock, flags);
863 hh->prim = DL_RELEASE_CNF;
865 return dsp->up->send(dsp->up, skb);
876 if (!dsp->b_active) {
880 hh->prim = PH_DATA_REQ;
881 spin_lock_irqsave(&dsp_lock, flags);
882 skb_queue_tail(&dsp->sendq, skb);
883 schedule_work(&dsp->workq);
884 spin_unlock_irqrestore(&dsp_lock, flags);
887 /* send data to tx-buffer (if no tone is played) */
888 if (!dsp->tone.tone) {
889 spin_lock_irqsave(&dsp_lock, flags);
890 dsp_cmx_transmit(dsp, skb);
891 spin_unlock_irqrestore(&dsp_lock, flags);
894 case (PH_CONTROL_REQ):
895 spin_lock_irqsave(&dsp_lock, flags);
896 ret = dsp_control_req(dsp, hh, skb);
897 spin_unlock_irqrestore(&dsp_lock, flags);
899 case (DL_ESTABLISH_REQ):
900 case (PH_ACTIVATE_REQ):
901 if (dsp_debug & DEBUG_DSP_CORE)
902 printk(KERN_DEBUG "%s: activating b_channel %s\n",
903 __func__, dsp->name);
904 if (dsp->dtmf.hardware || dsp->dtmf.software)
905 dsp_dtmf_goertzel_init(dsp);
907 /* enable fill_empty feature */
908 if (dsp->features_fill_empty)
910 /* send ph_activate */
911 hh->prim = PH_ACTIVATE_REQ;
913 return ch->recv(ch->peer, skb);
915 case (DL_RELEASE_REQ):
916 case (PH_DEACTIVATE_REQ):
917 if (dsp_debug & DEBUG_DSP_CORE)
918 printk(KERN_DEBUG "%s: releasing b_channel %s\n",
919 __func__, dsp->name);
920 spin_lock_irqsave(&dsp_lock, flags);
922 dsp->tone.hardware = 0;
923 dsp->tone.software = 0;
924 if (timer_pending(&dsp->tone.tl))
925 del_timer(&dsp->tone.tl);
927 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
929 skb_queue_purge(&dsp->sendq);
930 spin_unlock_irqrestore(&dsp_lock, flags);
931 hh->prim = PH_DEACTIVATE_REQ;
933 return ch->recv(ch->peer, skb);
936 if (dsp_debug & DEBUG_DSP_CORE)
937 printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
938 __func__, hh->prim, dsp->name);
947 dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
949 struct dsp *dsp = container_of(ch, struct dsp, ch);
953 if (debug & DEBUG_DSP_CTRL)
954 printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
961 dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
963 /* wait until workqueue has finished,
964 * must lock here, or we may hit send-process currently
966 spin_lock_irqsave(&dsp_lock, flags);
968 spin_unlock_irqrestore(&dsp_lock, flags);
969 /* MUST not be locked, because it waits until queue is done. */
970 cancel_work_sync(&dsp->workq);
971 spin_lock_irqsave(&dsp_lock, flags);
972 if (timer_pending(&dsp->tone.tl))
973 del_timer(&dsp->tone.tl);
974 skb_queue_purge(&dsp->sendq);
975 if (dsp_debug & DEBUG_DSP_CTRL)
976 printk(KERN_DEBUG "%s: releasing member %s\n",
977 __func__, dsp->name);
979 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
981 dsp_pipeline_destroy(&dsp->pipeline);
983 if (dsp_debug & DEBUG_DSP_CTRL)
984 printk(KERN_DEBUG "%s: remove & destroy object %s\n",
985 __func__, dsp->name);
986 list_del(&dsp->list);
987 spin_unlock_irqrestore(&dsp_lock, flags);
989 if (dsp_debug & DEBUG_DSP_CTRL)
990 printk(KERN_DEBUG "%s: dsp instance released\n",
993 module_put(THIS_MODULE);
1000 dsp_send_bh(struct work_struct *work)
1002 struct dsp *dsp = container_of(work, struct dsp, workq);
1003 struct sk_buff *skb;
1004 struct mISDNhead *hh;
1006 if (dsp->hdlc && dsp->data_pending)
1007 return; /* wait until data has been acknowledged */
1009 /* send queued data */
1010 while ((skb = skb_dequeue(&dsp->sendq))) {
1011 /* in locked date, we must have still data in queue */
1012 if (dsp->data_pending) {
1013 if (dsp_debug & DEBUG_DSP_CORE)
1014 printk(KERN_DEBUG "%s: fifo full %s, this is "
1015 "no bug!\n", __func__, dsp->name);
1016 /* flush transparent data, if not acked */
1020 hh = mISDN_HEAD_P(skb);
1021 if (hh->prim == DL_DATA_REQ) {
1022 /* send packet up */
1024 if (dsp->up->send(dsp->up, skb))
1029 /* send packet down */
1031 dsp->data_pending = 1;
1032 if (dsp->ch.recv(dsp->ch.peer, skb)) {
1034 dsp->data_pending = 0;
1043 dspcreate(struct channel_req *crq)
1048 if (crq->protocol != ISDN_P_B_L2DSP
1049 && crq->protocol != ISDN_P_B_L2DSPHDLC)
1050 return -EPROTONOSUPPORT;
1051 ndsp = vmalloc(sizeof(struct dsp));
1053 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1056 memset(ndsp, 0, sizeof(struct dsp));
1057 if (dsp_debug & DEBUG_DSP_CTRL)
1058 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1060 /* default enabled */
1061 INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1062 skb_queue_head_init(&ndsp->sendq);
1063 ndsp->ch.send = dsp_function;
1064 ndsp->ch.ctrl = dsp_ctrl;
1066 crq->ch = &ndsp->ch;
1067 if (crq->protocol == ISDN_P_B_L2DSP) {
1068 crq->protocol = ISDN_P_B_RAW;
1071 crq->protocol = ISDN_P_B_HDLC;
1074 if (!try_module_get(THIS_MODULE))
1075 printk(KERN_WARNING "%s:cannot get module\n",
1078 sprintf(ndsp->name, "DSP_C%x(0x%p)",
1079 ndsp->up->st->dev->id + 1, ndsp);
1080 /* set frame size to start */
1081 ndsp->features.hfc_id = -1; /* current PCM id */
1082 ndsp->features.pcm_id = -1; /* current PCM id */
1083 ndsp->pcm_slot_rx = -1; /* current CPM slot */
1084 ndsp->pcm_slot_tx = -1;
1085 ndsp->pcm_bank_rx = -1;
1086 ndsp->pcm_bank_tx = -1;
1087 ndsp->hfc_conf = -1; /* current conference number */
1088 /* set tone timer */
1089 ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1090 ndsp->tone.tl.data = (long) ndsp;
1091 init_timer(&ndsp->tone.tl);
1093 if (dtmfthreshold < 20 || dtmfthreshold > 500)
1094 dtmfthreshold = 200;
1095 ndsp->dtmf.treshold = dtmfthreshold*10000;
1097 /* init pipeline append to list */
1098 spin_lock_irqsave(&dsp_lock, flags);
1099 dsp_pipeline_init(&ndsp->pipeline);
1100 list_add_tail(&ndsp->list, &dsp_ilist);
1101 spin_unlock_irqrestore(&dsp_lock, flags);
1107 static struct Bprotocol DSP = {
1108 .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1109 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1114 static int dsp_init(void)
1119 printk(KERN_INFO "DSP modul %s\n", mISDN_dsp_revision);
1121 dsp_options = options;
1124 /* set packet size */
1127 if (dsp_poll > MAX_POLL) {
1128 printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1129 "maximum.\n", __func__, poll, MAX_POLL);
1134 printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1135 "minimum.\n", __func__, dsp_poll);
1139 dsp_tics = poll * HZ / 8000;
1140 if (dsp_tics * 8000 != poll * HZ) {
1141 printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1142 "samples (0,125 ms). It is not a multiple of "
1143 "%d HZ.\n", poll, HZ);
1149 while (poll <= MAX_POLL) {
1150 tics = (poll * HZ) / 8000;
1151 if (tics * 8000 == poll * HZ) {
1160 if (dsp_poll == 0) {
1161 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1162 "clock that equals exactly the duration of 8-256 "
1163 "samples. (Choose kernel clock speed like 100, 250, "
1168 printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1169 "%d jiffies.\n", dsp_poll, dsp_tics);
1171 spin_lock_init(&dsp_lock);
1172 INIT_LIST_HEAD(&dsp_ilist);
1173 INIT_LIST_HEAD(&conf_ilist);
1175 /* init conversion tables */
1176 dsp_audio_generate_law_tables();
1177 dsp_silence = (dsp_options&DSP_OPT_ULAW)?0xff:0x2a;
1178 dsp_audio_law_to_s32 = (dsp_options&DSP_OPT_ULAW)?dsp_audio_ulaw_to_s32:
1179 dsp_audio_alaw_to_s32;
1180 dsp_audio_generate_s2law_table();
1181 dsp_audio_generate_seven();
1182 dsp_audio_generate_mix_table();
1183 if (dsp_options & DSP_OPT_ULAW)
1184 dsp_audio_generate_ulaw_samples();
1185 dsp_audio_generate_volume_changes();
1187 err = dsp_pipeline_module_init();
1189 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
1190 "error(%d)\n", err);
1194 err = mISDN_register_Bprotocol(&DSP);
1196 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1200 /* set sample timer */
1201 dsp_spl_tl.function = (void *)dsp_cmx_send;
1202 dsp_spl_tl.data = 0;
1203 init_timer(&dsp_spl_tl);
1204 dsp_spl_tl.expires = jiffies + dsp_tics;
1205 dsp_spl_jiffies = dsp_spl_tl.expires;
1206 add_timer(&dsp_spl_tl);
1212 static void dsp_cleanup(void)
1214 mISDN_unregister_Bprotocol(&DSP);
1216 if (timer_pending(&dsp_spl_tl))
1217 del_timer(&dsp_spl_tl);
1219 if (!list_empty(&dsp_ilist)) {
1220 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1223 if (!list_empty(&conf_ilist)) {
1224 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1225 "all memory freed.\n");
1228 dsp_pipeline_module_exit();
1231 module_init(dsp_init);
1232 module_exit(dsp_cleanup);