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mISDN/drivers/isdn/hardware/mISDN/dsp_core.c

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new DSP functions from jolly for conferencing and other audio processing
2003-10-24 21:23:05 +00:00
/* $Id$
*
* Author Andreas Eversberg (jolly@jolly.de)
* Based on source code structure by
* Karsten Keil (keil@isdn4linux.de)
*
* This file is (c) under GNU PUBLIC LICENSE
* For changes and modifications please read
* ../../../Documentation/isdn/mISDN.cert
*
* Thanks to Karsten Keil (great drivers)
* Cologne Chip (great chips)
*
* This module does:
* Real-time tone generation
* DTMF detection
* Real-time cross-connection and conferrence
* Compensate jitter due to system load and hardware fault.
* All features are done in kernel space and will be realized
* using hardware, if available and supported by chip set.
*/
/* STRUCTURE:
*
* The dsp module provides layer 2 for b-channels (64kbit). It provides
* transparent audio forwarding with special digital signal processing:
*
* - (1) generation of tones
* - (2) detection of dtmf tones
* - (3) crossconnecting and conferences
* - (4) echo generation for delay test
* - (5) volume control
* - (6) disable receive data
*
* Look:
* TX RX
* ------upper layer------
* | ^
* | |(6)
* v |
* +-----+-------------+-----+
* |(3)(4) |
* | |
* | |
* | CMX |
* | |
* | |
* | |
* | |
* | +-------------+
* | | ^
* | | |
* | | |
* |+---------+| +----+----+
* ||(1) || |(5) |
* || || | |
* || Tones || |RX Volume|
* || || | |
* || || | |
* |+----+----+| +----+----+
* +-----+-----+ ^
* | |
* | |
* v |
* +----+----+ +----+----+
* |(5) | |(2) |
* | | | |
* |TX Volume| | DTMF |
* | | | |
* | | | |
* +----+----+ +----+----+
* | ^
* | |
* v |
* ------card layer------
* TX RX
*
* Above you can see the logical data flow. If software is used to do the
* process, it is actually the real data flow. If hardware is used, data
* may not flow, but hardware commands to the card, to provide the data flow
* as shown.
*
* NOTE: The channel must be activated in order to make dsp work, even if
* no data flow to the upper layer is intended. Activation can be done
* after and before controlling the setting using PH_CONTROL requests.
*
* DTMF: Will be detected by hardware if possible. It is done before CMX
* processing.
*
* Tones: Will be generated via software if endless looped audio fifos are
* not supported by hardware. Tones will override all data from CMX.
* It is not required to join a conference to use tones at any time.
*
* CMX: Is transparent when not used. When it is used, it will do
* crossconnections and conferences via software if not possible through
* hardware. If hardware capability is available, hardware is used.
*
* Echo: Is generated by CMX and is used to check performane of hard and
* software CMX.
*
* The CMX has special functions for conferences with one, two and more
* members. It will allow different types of data flow. Receive and transmit
* data to/form upper layer may be swithed on/off individually without loosing
* features of CMX, Tones and DTMF.
*
* If all used features can be realized in hardware, and if transmit and/or
* receive data ist disabled, the card may not send/receive any data at all.
* Not receiving is usefull if only announcements are played. Not sending is
* usefull if an answering machine records audio. Not sending and receiving is
* usefull during most states of the call. If supported by hardware, tones
* will be played without cpu load. Small PBXs and NT-Mode applications will
* not need expensive hardware when processing calls.
*
*
* LOCKING:
*
* When data is received from upper or lower layer (card), the complete dsp
* module is locked by a global lock. When data is ready to be transmitted
* to a different layer, the module is unlocked. It is not allowed to hold a
* lock outside own layer.
* Reasons: Multiple threads must not process cmx at the same time, if threads
* serve instances, that are connected in same conference.
* PH_CONTROL must not change any settings, join or split conference members
* during process of data.
*
*
* TRANSMISSION:
*
TBD
There are three things that need to receive data from card:
- software DTMF decoder
- software cmx (if conference exists)
- upper layer, if rx-data not disabled
Whenever dtmf decoder is turned on or off, software cmx changes, rx-data is disabled or enabled, or card becomes activated, then rx-data is disabled or enabled using a special command to the card.
There are three things that need to transmit data to card:
- software tone generation (part of cmx)
- software cmx
- upper layer, if tx-data is written to tx-buffer
Whenever cmx is changed, or data is sent from upper layer, the transmission is triggered by an silence freame (if not already tx_pending==1). When the confirm is received from card, next frame is
sent using software cmx, if tx-data is still available, or if software tone generation is used,
or if cmx is currently using software.
*/
#ifdef WITH_HARDWARE
alle einstellungen der hardware sollten in einer struktur hinterlegt werden.
sobald der channel aktiviert wird, wird diese struktur an den hfc-chip gesendet.
wenn sich die daten der hardware ändern, gibt es eben ein update der struktur,
die an den hfc-chip gesendet wird (wenn aktiv).
beim PH_DEACTIVATE sollten daten zur deaktivierung der hardware gesendet werden.
die daten der struktur
- conference number
- other crossconnect member
- loop
- rx_data
- dtmf
- law-codec
- tone-loop
- volume
- loop
#endif
const char *dsp_revision = "$Revision$";
#include <linux/delay.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include "layer1.h"
#include "helper.h"
#include "debug.h"
#include "dsp.h"
#include "hw_lock.h"
static char DSPName[] = "DSP";
mISDNobject_t dsp_obj;
static mISDN_HWlock_t dsp_lock;
static int debug = 0;
static int options = 0;
/* options may be:
*
* bit 0 = use ulaw instead of alaw
* bit 1 = disable hfc hardware accelleration
* bit 2 = disable flipping of card's data bit order
*
*/
#define DSP_OPT_ULAW (1<<0)
#define DSP_OPT_NOHARDWARE (1<<1)
#define DSP_OPT_NOFLIP (1<<2)
#ifdef MODULE
MODULE_AUTHOR("Andreas Eversberg");
MODULE_PARM(debug, "1i");
MODULE_PARM(options, "1i");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
#endif
/*
* sending next frame to card (triggered by PH_ACTIVAT and PH_DATA_CONF)
*/
static void
sendevent(dsp_t *dsp)
{
struct sk_buff *nskb;
lock_HW(&dsp_lock, 0);
dsp->tx_pending = 0;
if (dsp->b_active) {
/* get data from cmx */
nskb = dsp_cmx_send(dsp, SEND_LEN, 0);
if (!nskb) {
printk(KERN_ERR "%s: failed to create subsequent packet\n", __FUNCTION__);
unlock_HW(&dsp_lock);
return;
}
/* change volume if requested */
if (dsp->tx_volume)
dsp_change_volume(nskb, dsp->tx_volume, dsp->ulaw);
/* send subsequent requests to card */
unlock_HW(&dsp_lock);
if (dsp->inst.down.func(&dsp->inst.down, nskb)) {
printk(KERN_ERR "%s: failed to send subsequent packet\n", __FUNCTION__);
dev_kfree_skb(nskb);
}
} else
unlock_HW(&dsp_lock);
}
/*
* special message process for DL_CONTROL | REQUEST
*/
static int
dsp_control_req(dsp_t *dsp, mISDN_head_t *hh, struct sk_buff *skb)
{
int ret = 0;
int cont;
unsigned char *data;
int len;
if (skb->len < sizeof(int)) {
printk(KERN_ERR "%s: PH_CONTROL message too short\n", __FUNCTION__);
}
cont = *((int *)skb->data);
len = skb->len - sizeof(int);
data = skb->data + sizeof(int);
switch (cont) {
case DTMF_TONE_START: /* turn on DTMF */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: start dtmf\n", __FUNCTION__);
dsp_dtmf_goertzel_init(dsp);
/* checking for hardware capability */
#ifdef WITH_HARDWARE
if (...............) {
dsp->dtmf.hardware = 2;
dsp->dtmf.software = 0;
} else {
#endif
dsp->dtmf.hardware = 0;
dsp->dtmf.software = 1;
#ifdef WITH_HARDWARE
}
auch hier muss der chip davon erfahren
auch beim TONE_STOP muss der chip was erfahren.
bedenke activate un deactivate.
#endif
break;
case DTMF_TONE_STOP: /* turn off DTMF */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: stop dtmf\n", __FUNCTION__);
dsp->dtmf.hardware = 0;
dsp->dtmf.software = 0;
break;
case CMX_CONF_JOIN: /* join / update conference */
if (len != sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->conf_id = *((int *)data);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: join conference %d\n", __FUNCTION__, dsp->conf_id);
ret = dsp_cmx(dsp);
if (debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case CMX_CONF_SPLIT: /* remove from conference */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: release conference\n", __FUNCTION__);
dsp->conf_id = 0;
ret = dsp_cmx(dsp);
if (debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case TONE_PATT_ON: /* play tone */
if (len != sizeof(int)) {
ret = -EINVAL;
break;
}
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn tone 0x%x on\n", __FUNCTION__, *((int *)skb->data));
ret = dsp_tone(dsp, *((int *)data));
if (!ret && dsp->conf_id)
ret = dsp_cmx(dsp);
if (ret)
dsp_tone(dsp, 0);
if (!dsp->tone.tone)
goto tone_off;
break;
case TONE_PATT_OFF: /* stop tone */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn tone off\n", __FUNCTION__);
dsp_tone(dsp, 0);
if (dsp->conf_id)
ret = dsp_cmx(dsp);
/* reset tx buffers (user space data) */
tone_off:
dsp->R_tx = dsp->W_tx = 0;
break;
case VOL_CHANGE_TX: /* change volume */
if (len != sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->tx_volume = *((int *)data);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: change tx volume to %d\n", __FUNCTION__, dsp->tx_volume);
if (dsp->conf_id)
ret = dsp_cmx(dsp);
break;
case VOL_CHANGE_RX: /* change volume */
if (len != sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->rx_volume = *((int *)data);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: change rx volume to %d\n", __FUNCTION__, dsp->tx_volume);
if (dsp->conf_id)
ret = dsp_cmx(dsp);
break;
#warning bedenke in pbx: volume -8 ... 8 (auch doku) auch >8 sollte 0 sein
case CMX_ECHO_ON: /* enable echo */
dsp->echo = 1;
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable cmx-echo\n", __FUNCTION__);
if (dsp->conf_id)
ret = dsp_cmx(dsp);
if (debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case CMX_ECHO_OFF: /* disable echo */
dsp->echo = 0;
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable cmx-echo\n", __FUNCTION__);
if (dsp->conf_id)
ret = dsp_cmx(dsp);
if (debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case CMX_RECEIVE_ON: /* enable receive to user space */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable receive to user space\n", __FUNCTION__);
dsp->rx_disabled = 0;
if (dsp->conf_id)
ret = dsp_cmx(dsp);
break;
case CMX_RECEIVE_OFF: /* disable receive to user space */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable receive to user space\n", __FUNCTION__);
dsp->rx_disabled = 1;
if (dsp->conf_id)
ret = dsp_cmx(dsp);
break;
case CMX_MIX_ON: /* enable mixing of transmit data with conference members */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable mixing of tx-data with conf mebers\n", __FUNCTION__);
dsp->tx_mix = 1;
if (dsp->conf_id)
ret = dsp_cmx(dsp);
if (debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case CMX_MIX_OFF: /* disable mixing of transmit data with conference members */
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable mixing of tx-data with conf mebers\n", __FUNCTION__);
dsp->tx_mix = 0;
if (dsp->conf_id)
ret = dsp_cmx(dsp);
if (debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
default:
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: ctrl req %x unhandled\n", __FUNCTION__, cont);
ret = -EINVAL;
}
return(ret);
}
/*
* messages from upper layers
*/
static int
dsp_from_up(mISDNif_t *hif, struct sk_buff *skb)
{
dsp_t *dsp;
mISDN_head_t *hh;
int ret = 0;
if (!hif || !hif->fdata || !skb)
return(-EINVAL);
dsp = hif->fdata;
if (!dsp->inst.down.func)
return(-ENXIO);
hh = mISDN_HEAD_P(skb);
#warning #entweder kein l2 oder PH in DL wandeln
switch(hh->prim) {
case DL_DATA | RESPONSE:
case PH_DATA | RESPONSE:
/* ignore response */
break;
case DL_DATA | REQUEST:
case PH_DATA | REQUEST:
lock_HW(&dsp_lock, 0);
/* send data to tx-buffer (if no tone is played) */
if (!dsp->tone.tone)
dsp_cmx_transmit(dsp, skb);
unlock_HW(&dsp_lock);
break;
case PH_CONTROL | REQUEST:
lock_HW(&dsp_lock, 0);
ret = dsp_control_req(dsp, hh, skb);
unlock_HW(&dsp_lock);
break;
case DL_ESTABLISH | REQUEST:
case PH_ACTIVATE | REQUEST:
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: activating b_channel\n", __FUNCTION__);
lock_HW(&dsp_lock, 0);
dsp->tx_pending = 0;
if (dsp->dtmf.hardware || dsp->dtmf.software)
dsp_dtmf_goertzel_init(dsp);
unlock_HW(&dsp_lock);
hh->prim = PH_ACTIVATE | REQUEST;
return(dsp->inst.down.func(&dsp->inst.down, skb));
case DL_RELEASE | REQUEST:
case PH_DEACTIVATE | REQUEST:
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: releasign b_channel\n", __FUNCTION__);
lock_HW(&dsp_lock, 0);
dsp->tx_pending = 0;
unlock_HW(&dsp_lock);
hh->prim = PH_DEACTIVATE | REQUEST;
return(dsp->inst.down.func(&dsp->inst.down, skb));
default:
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: msg %x unhandled\n", __FUNCTION__, hh->prim);
ret = -EINVAL;
break;
}
if (!ret)
dev_kfree_skb(skb);
return(ret);
}
/*
* messages from lower layers
*/
static int
dsp_from_down(mISDNif_t *hif, struct sk_buff *skb)
{
dsp_t *dsp;
mISDN_head_t *hh;
int ret = 0;
unsigned char *digits;
int cont;
struct sk_buff *nskb;
if (!hif || !hif->fdata || !skb)
return(-EINVAL);
dsp = hif->fdata;
if (!dsp->inst.up.func)
return(-ENXIO);
hh = mISDN_HEAD_P(skb);
switch(hh->prim)
{
case PH_DATA | CONFIRM:
case DL_DATA | CONFIRM:
lock_HW(&dsp_lock, 0);
dsp->tx_pending = 1;
schedule_work(&dsp->sendwork);
unlock_HW(&dsp_lock);
break;
case PH_DATA | INDICATION:
case DL_DATA | INDICATION:
//#warning remove
//hh->prim = DL_DATA | INDICATION;
//return(dsp->inst.up.func(&dsp->inst.up, skb));
lock_HW(&dsp_lock, 0);
/* check if dtmf soft decoding is turned on */
if (dsp->dtmf.software) {
digits = dsp_dtmf_goertzel_decode(dsp, skb->data, skb->len, dsp->ulaw);
if (digits) while(*digits) {
if (dsp->debug & DEBUG_DSP_DTMF)
printk(KERN_DEBUG "%s: sending software decoded digit(%c) to upper layer\n", __FUNCTION__, *digits);
cont = DTMF_TONE_VAL | *digits;
nskb = create_link_skb(PH_CONTROL | INDICATION, 0, sizeof(int), &cont, 0);
unlock_HW(&dsp_lock);
if (!nskb)
break;
if (dsp->inst.up.func(&dsp->inst.up, nskb))
dev_kfree_skb(nskb);
lock_HW(&dsp_lock, 0);
digits++;
}
}
/* change volume if requested */
if (dsp->rx_volume)
dsp_change_volume(skb, dsp->rx_volume, dsp->ulaw);
/* process data from card at cmx */
dsp_cmx_receive(dsp, skb);
if (dsp->rx_disabled) {
/* if receive is not allowed */
unlock_HW(&dsp_lock);
break;
}
unlock_HW(&dsp_lock);
hh->prim = DL_DATA | INDICATION;
return(dsp->inst.up.func(&dsp->inst.up, skb));
case PH_CONTROL | INDICATION:
lock_HW(&dsp_lock, 0);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: PH_CONTROL received: %x\n", __FUNCTION__, hh->dinfo);
switch (hh->dinfo) {
case HW_HFC_COEFF: /* getting coefficients */
if (dsp->dtmf.hardware == 2)
if (dsp->inst.up.func) {
digits = dsp_dtmf_goertzel_decode(dsp, skb->data, skb->len, 2);
if (digits) while(*digits) {
int k;
struct sk_buff *nskb;
if (dsp->debug & DEBUG_DSP_DTMF)
printk(KERN_DEBUG "%s: now sending software decoded digit(%c) to upper layer\n", __FUNCTION__, *digits);
k = *digits | DTMF_TONE_VAL;
nskb = create_link_skb(PH_CONTROL | INDICATION, 0, sizeof(int), &k, 0);
unlock_HW(&dsp_lock);
if (!nskb)
break;
if (dsp->inst.up.func(&dsp->inst.up, nskb))
dev_kfree_skb(nskb);
lock_HW(&dsp_lock, 0);
digits++;
}
}
break;
default:
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: ctrl ind %x unhandled\n", __FUNCTION__, hh->dinfo);
ret = -EINVAL;
}
unlock_HW(&dsp_lock);
break;
case PH_ACTIVATE | CONFIRM:
lock_HW(&dsp_lock, 0);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: b_channel is now active\n", __FUNCTION__);
/* bchannel now active */
dsp->b_active = 1;
dsp->W_tx = dsp->R_tx = 0; /* clear TX buffer */
dsp->W_rx = dsp->R_rx = 0; /* clear RX buffer */
if (dsp->conf)
dsp->W_rx = dsp->R_rx = dsp->conf->W_max;
memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
if (dsp->conf_id)
ret = dsp_cmx(dsp);
/* now trigger transmission */
dsp->tx_pending = 1;
schedule_work(&dsp->sendwork);
unlock_HW(&dsp_lock);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: done with activation, sending confirm to user space.\n", __FUNCTION__);
/* send activation to upper layer */
hh->prim = DL_ESTABLISH | CONFIRM;
return(dsp->inst.up.func(&dsp->inst.up, skb));
case PH_DEACTIVATE | CONFIRM:
lock_HW(&dsp_lock, 0);
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: b_channel is now inactive\n", __FUNCTION__);
/* bchannel now inactive */
dsp->b_active = 0;
if (dsp->conf_id)
dsp_cmx(dsp);
unlock_HW(&dsp_lock);
hh->prim = DL_RELEASE | CONFIRM;
return(dsp->inst.up.func(&dsp->inst.up, skb));
default:
if (dsp->debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: msg %x unhandled\n", __FUNCTION__, hh->prim);
ret = -EINVAL;
}
if (!ret)
dev_kfree_skb(skb);
return(ret);
}
/*
* desroy DSP instances
*/
static void
release_dsp(dsp_t *dsp)
{
mISDNinstance_t *inst = &dsp->inst;
conference_t *conf;
#ifdef HAS_WORKQUEUE
if (dsp->sendwork.pending)
printk(KERN_ERR "%s: pending sendwork: %lx\n", __FUNCTION__, dsp->sendwork.pending);
#else
if (dsp->sendwork.sync)
printk(KERN_ERR "%s: pending sendwork: %lx\n", __FUNCTION__, dsp->sendwork.sync);
#endif
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: removing conferences\n", __FUNCTION__);
conf = dsp->conf;
if (conf) {
dsp_cmx_del_conf_member(dsp);
if (!conf->mlist) {
dsp_cmx_del_conf(conf);
}
}
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: disconnecting instances\n", __FUNCTION__);
if (inst->up.peer) {
inst->up.peer->obj->ctrl(inst->up.peer,
MGR_DISCONNECT | REQUEST, &inst->up);
}
if (inst->down.peer) {
inst->down.peer->obj->ctrl(inst->down.peer,
MGR_DISCONNECT | REQUEST, &inst->down);
}
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: remove & destroy object\n", __FUNCTION__);
REMOVE_FROM_LISTBASE(dsp, ((dsp_t *)dsp_obj.ilist));
dsp_obj.ctrl(inst, MGR_UNREGLAYER | REQUEST, NULL);
vfree(dsp);
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: dsp instance released\n", __FUNCTION__);
}
/*
* create new DSP instances
*/
static int
new_dsp(mISDNstack_t *st, mISDN_pid_t *pid)
{
dsp_t *ndsp;
int err = 0;
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: creating new dsp instance\n", __FUNCTION__);
if (!st || !pid)
return(-EINVAL);
#warning KARSTEN: How can i prevent memory swapping AND if currently swapped, restore from swap?
if (!(ndsp = vmalloc(sizeof(dsp_t)))) {
printk(KERN_ERR "%s: vmalloc dsp_t failed\n", __FUNCTION__);
return(-ENOMEM);
}
memset(ndsp, 0, sizeof(dsp_t));
memcpy(&ndsp->inst.pid, pid, sizeof(mISDN_pid_t));
ndsp->inst.obj = &dsp_obj;
ndsp->inst.data = ndsp;
if (!SetHandledPID(&dsp_obj, &ndsp->inst.pid)) {
int_error();
err = -ENOPROTOOPT;
free_mem:
vfree(ndsp);
return(err);
}
strcpy(ndsp->inst.name, "DSP");
strchr(ndsp->inst.name, '\0')[-1] = '\0';
ndsp->debug = debug;
ndsp->inst.up.owner = &ndsp->inst;
ndsp->inst.down.owner = &ndsp->inst;
if (options & DSP_OPT_ULAW) {
/* use ulaw instead of alaw */
ndsp->ulaw = 1;
}
#ifdef WITH_HARDWARE
if (!(options & DSP_OPT_NOHARDWARE)) {
/* check if b-channel is on hfc_chip (0 = no chip) */
hier muss noch herausgefunden werden, wie ich erfrage, ob und
welcher hfc-chip verwendet wird (0 = kein chip)
ndsp->hfc_id = ;
}
#endif
INIT_WORK(&ndsp->sendwork, (void *)(void *)sendevent, ndsp);
APPEND_TO_LIST(ndsp, ((dsp_t *)dsp_obj.ilist));
err = dsp_obj.ctrl(st, MGR_REGLAYER | INDICATION, &ndsp->inst);
if (err) {
printk(KERN_ERR "%s: failed to register layer\n", __FUNCTION__);
REMOVE_FROM_LISTBASE(ndsp, ((dsp_t *)dsp_obj.ilist));
goto free_mem;
} else {
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: dsp instance created\n", __FUNCTION__);
}
return(err);
}
/*
* manager for DSP instances
*/
static int
dsp_manager(void *data, u_int prim, void *arg) {
mISDNinstance_t *inst = data;
dsp_t *dspl = (dsp_t *)dsp_obj.ilist;
int ret = 0;
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: data:%p prim:%x arg:%p\n", __FUNCTION__, data, prim, arg);
if (!data)
return(-EINVAL);
while(dspl) {
if (&dspl->inst == inst)
break;
dspl = dspl->next;
}
switch(prim) {
case MGR_NEWLAYER | REQUEST:
lock_HW(&dsp_lock, 0);
ret = new_dsp(data, arg);
unlock_HW(&dsp_lock);
break;
case MGR_CONNECT | REQUEST:
if (!dspl) {
printk(KERN_WARNING "%s: given instance(%p) not in ilist.\n", __FUNCTION__, data);
ret = -EINVAL;
break;
}
ret = ConnectIF(inst, arg);
break;
case MGR_SETIF | REQUEST:
case MGR_SETIF | INDICATION:
if (!dspl) {
printk(KERN_WARNING "%s: given instance(%p) not in ilist.\n", __FUNCTION__, data);
ret = -EINVAL;
break;
}
ret = SetIF(inst, arg, prim, dsp_from_up, dsp_from_down, dspl);
break;
case MGR_DISCONNECT | REQUEST:
case MGR_DISCONNECT | INDICATION:
if (!dspl) {
printk(KERN_WARNING "%s: given instance(%p) not in ilist.\n", __FUNCTION__, data);
ret = -EINVAL;
break;
}
ret = DisConnectIF(inst, arg);
break;
case MGR_UNREGLAYER | REQUEST:
case MGR_RELEASE | INDICATION:
if (!dspl) {
printk(KERN_WARNING "%s: given instance(%p) not in ilist.\n", __FUNCTION__, data);
ret = -EINVAL;
break;
}
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: release_dsp id %x\n", __FUNCTION__, dspl->inst.st->id);
lock_HW(&dsp_lock, 0);
release_dsp(dspl);
unlock_HW(&dsp_lock);
break;
default:
printk(KERN_WARNING "%s: prim %x not handled\n", __FUNCTION__, prim);
ret = -EINVAL;
break;
}
return(ret);
}
/*
* initialize DSP object
*/
static int dsp_init(void)
{
int err;
/* display revision */
printk(KERN_INFO "mISDN_dsp: Audio DSP Rev. %s (debug=0x%x)\n", mISDN_getrev(dsp_revision), debug);
/* fill mISDN object (dsp_obj) */
memset(&dsp_obj, 0, sizeof(dsp_obj));
SET_MODULE_OWNER(dsp_obj);
dsp_obj.name = DSPName;
dsp_obj.BPROTO.protocol[3] = ISDN_PID_L3_B_DSP;
dsp_obj.own_ctrl = dsp_manager;
dsp_obj.prev = NULL;
dsp_obj.next = NULL;
dsp_obj.ilist = NULL;
/* initialize audio tables */
dsp_audio_flip_tables(options & DSP_OPT_NOFLIP);
dsp_audio_generate_s2law_tables(options & DSP_OPT_NOFLIP);
dsp_audio_flip_and_generate_ulaw_samples(options & DSP_OPT_NOFLIP);
dsp_audio_generate_volume_changes();
/* init global lock */
lock_HW_init(&dsp_lock);
/* register object */
if ((err = mISDN_register(&dsp_obj))) {
printk(KERN_ERR "mISDN_dsp: Can't register %s error(%d)\n", DSPName, err);
return(err);
}
return(0);
}
/*
* cleanup DSP object during module removal
*/
static void dsp_cleanup(void)
{
int err;
if (debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: removing module\n", __FUNCTION__);
if ((err = mISDN_unregister(&dsp_obj))) {
printk(KERN_ERR "mISDN_dsp: Can't unregister Audio DSP error(%d)\n",
err);
}
if(dsp_obj.ilist) {
printk(KERN_WARNING "mISDN_dsp: Audio DSP object inst list not empty.\n");
while(dsp_obj.ilist)
release_dsp(dsp_obj.ilist);
}
if (Conf_list) {
printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not all memory freed.\n");
}
}
#ifdef MODULE
module_init(dsp_init);
module_exit(dsp_cleanup);
#endif