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

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/* $Id$
*
* Author Andreas Eversberg (jolly@eversberg.eu)
* 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.
* Blowfish encryption/decryption
*/
/* 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
* - (7) echo cancelation
* - (8) encryption/decryption
*
* Look:
* TX RX
* ------upper layer------
* | ^
* | |(6)
* v |
* +-----+-------------+-----+
* |(3)(4) |
* | CMX |
* | |
* | +-------------+
* | | ^
* | | |
* |+---------+| +----+----+
* ||(1) || |(5) |
* || || | |
* || Tones || |RX Volume|
* || || | |
* || || | |
* |+----+----+| +----+----+
* +-----+-----+ ^
* | |
* v |
* +----+----+ +----+----+
* |(5) | |(2) |
* | | | |
* |TX Volume| | DTMF |
* | | | |
* | | | |
* +----+----+ +----+----+
* | ^
* | |
* v |
* +----+-------------+----+
* |(7) |
* | |
* | Echo Cancellation |
* | |
* | |
* +----+-------------+----+
* | ^
* | |
* v |
* +----+----+ +----+----+
* |(8) | |(8) |
* | | | |
* | Encrypt | | Decrypt |
* | | | |
* | | | |
* +----+----+ +----+----+
* | ^
* | |
* 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.
*
* Echo Cancellation: Sometimes we like to cancel echo from the interface.
* Note that a VoIP call may not have echo caused by the IP phone. The echo
* is generated by the telephone line connected to it. Because the delay
* is high, it becomes an echo. RESULT: Echo Cachelation is required if
* both echo AND delay is applied to an interface.
* Remember that software CMX always generates a more or less delay.
*
* 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
*/
const char *dsp_revision = "$Revision$";
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include "core.h"
#include "layer1.h"
#include "helper.h"
#include "debug.h"
#include "dsp.h"
static char DSPName[] = "DSP";
mISDNobject_t dsp_obj;
static int debug = 0;
int dsp_debug;
static int options = 0;
int dsp_options;
static int poll = 0;
int dsp_poll, dsp_tics;
int dtmfthreshold=100L;
#ifdef MODULE
MODULE_AUTHOR("Andreas Eversberg");
#ifdef OLD_MODULE_PARAM
MODULE_PARM(debug, "1i");
MODULE_PARM(options, "1i");
MODULE_PARM(poll, "1i");
MODULE_PARM(dtmfthreshold, "1i");
#else
module_param(debug, uint, S_IRUGO | S_IWUSR);
module_param(options, uint, S_IRUGO | S_IWUSR);
module_param(poll, uint, S_IRUGO | S_IWUSR);
module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
#endif
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
#endif
/*
* special message process for DL_CONTROL | REQUEST
*/
static int
dsp_control_req(dsp_t *dsp, mISDN_head_t *hh, struct sk_buff *skb)
{
struct sk_buff *nskb;
int ret = 0;
int cont;
u8 *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__);
#if 0
if (len == sizeof(int)) {
printk(KERN_NOTICE "changing DTMF Threshold to %d\n",*((int*)data));
dsp->dtmf.treshold=(*(int*)data)*10000;
}
#endif
dsp_dtmf_goertzel_init(dsp);
dsp->dtmf.software = 0;
dsp->dtmf.hardware = 0;
/* checking for hardware capability */
spin_lock(&dsp->feature_lock);
if (dsp->feature_state != FEAT_STATE_RECEIVED) {
dsp->queue_dtmf=1;
spin_unlock(&dsp->feature_lock);
break;
}
spin_unlock(&dsp->feature_lock);
if (dsp->features.hfc_dtmf) {
dsp->dtmf.hardware = 1;
} else {
dsp->dtmf.software = 1;
}
break;
case DTMF_TONE_STOP: /* turn off DTMF */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: stop dtmf\n", __FUNCTION__);
dsp->queue_dtmf=0;
dsp->dtmf.hardware = 0;
dsp->dtmf.software = 0;
break;
case CMX_CONF_JOIN: /* join / update conference */
if (len != sizeof(int)) {
ret = -EINVAL;
break;
}
if (*((u32 *)data) == 0)
goto conf_split;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: join conference %d\n", __FUNCTION__, *((u32 *)data));
ret = dsp_cmx_conf(dsp, *((u32 *)data));
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case CMX_CONF_SPLIT: /* remove from conference */
conf_split:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: release conference\n", __FUNCTION__);
ret = dsp_cmx_conf(dsp, 0);
if (dsp_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_cmx_hardware(dsp->conf, dsp);
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);
dsp_cmx_hardware(dsp->conf, dsp);
/* reset tx buffers (user space data) */
tone_off:
dsp->tx_R = dsp->tx_W = 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);
dsp_cmx_hardware(dsp->conf, 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);
dsp_cmx_hardware(dsp->conf, dsp);
break;
case CMX_ECHO_ON: /* enable echo */
dsp->echo = 1; /* soft echo */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable cmx-echo\n", __FUNCTION__);
dsp_cmx_hardware(dsp->conf, dsp);
if (dsp_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__);
dsp_cmx_hardware(dsp->conf, dsp);
if (dsp_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;
dsp_cmx_hardware(dsp->conf, 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;
dsp_cmx_hardware(dsp->conf, 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;
dsp_cmx_hardware(dsp->conf, dsp);
if (dsp_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;
dsp_cmx_hardware(dsp->conf, dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case ECHOCAN_ON: /* turn echo calcellation on */
if (len<4) {
ret = -EINVAL;
} else {
int ec_arr[2];
memcpy(&ec_arr,data,sizeof(ec_arr));
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn echo cancelation on (delay=%d attenuation-shift=%d\n",
__FUNCTION__, ec_arr[0], ec_arr[1]);
ret = dsp_cancel_init(dsp, ec_arr[0], ec_arr[1] ,1);
dsp_cmx_hardware(dsp->conf, dsp);
}
break;
case ECHOCAN_OFF: /* turn echo calcellation off */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn echo cancelation off\n", __FUNCTION__);
ret = dsp_cancel_init(dsp, 0,0,-1);
dsp_cmx_hardware(dsp->conf, dsp);
break;
case BF_ENABLE_KEY: /* turn blowfish on */
if (len<4 || len>56) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn blowfish on (key not shown)\n", __FUNCTION__);
ret = dsp_bf_init(dsp, (u8*)data, len);
/* set new cont */
if (!ret)
cont = BF_ACCEPT;
else
cont = BF_REJECT;
/* send indication if it worked to set it */
nskb = create_link_skb(PH_CONTROL | INDICATION, 0, sizeof(int), &cont, 0);
if (mISDN_queue_up(&dsp->inst, 0, nskb))
dev_kfree_skb(nskb);
if (!ret)
dsp_cmx_hardware(dsp->conf, dsp);
break;
case BF_DISABLE: /* turn blowfish off */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn blowfish off\n", __FUNCTION__);
dsp_bf_cleanup(dsp);
dsp_cmx_hardware(dsp->conf, dsp);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: ctrl req %x unhandled\n", __FUNCTION__, cont);
ret = -EINVAL;
}
if (!ret)
dev_kfree_skb(skb);
return(ret);
}
/*
* messages from upper layers
*/
static int
dsp_from_up(mISDNinstance_t *inst, struct sk_buff *skb)
{
dsp_t *dsp;
mISDN_head_t *hh;
int ret = 0;
u_long flags;
if (!skb)
return(-EINVAL);
dsp = inst->privat;
if (!dsp) {
return(-EIO);
}
hh = mISDN_HEAD_P(skb);
switch(hh->prim) {
case DL_DATA | RESPONSE:
case PH_DATA | RESPONSE:
/* ignore response */
dev_kfree_skb(skb);
break;
case DL_DATA | REQUEST:
case PH_DATA | REQUEST:
if (skb->len < 1)
return(-EINVAL);
/* send data to tx-buffer (if no tone is played) */
spin_lock_irqsave(&dsp_obj.lock, flags);
if (!dsp->tone.tone)
dsp_cmx_transmit(dsp, skb);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
dev_kfree_skb(skb);
break;
case PH_CONTROL | REQUEST:
spin_lock_irqsave(&dsp_obj.lock, flags);
ret = dsp_control_req(dsp, hh, skb);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
break;
case DL_ESTABLISH | REQUEST:
case PH_ACTIVATE | REQUEST:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: activating b_channel %s\n", __FUNCTION__, dsp->inst.name);
if (dsp->dtmf.hardware || dsp->dtmf.software)
dsp_dtmf_goertzel_init(dsp);
hh->prim = PH_ACTIVATE | REQUEST;
ret = mISDN_queue_down(&dsp->inst, 0, skb);
break;
case DL_RELEASE | REQUEST:
case PH_DEACTIVATE | REQUEST:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: releasing b_channel %s\n", __FUNCTION__, dsp->inst.name);
dsp->tone.tone = dsp->tone.hardware = dsp->tone.software = 0;
if (timer_pending(&dsp->tone.tl))
del_timer(&dsp->tone.tl);
hh->prim = PH_DEACTIVATE | REQUEST;
ret = mISDN_queue_down(&dsp->inst, 0, skb);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: msg %x unhandled %s\n", __FUNCTION__, hh->prim, dsp->inst.name);
ret = -EINVAL;
break;
}
return(ret);
}
/*
* messages from lower layers
*/
static int
dsp_from_down(mISDNinstance_t *inst, struct sk_buff *skb)
{
dsp_t *dsp;
mISDN_head_t *hh;
int ret = 0;
u8 *digits;
int cont;
struct sk_buff *nskb;
u_long flags;
if (!skb)
return(-EINVAL);
dsp = inst->privat;
if (!dsp)
return(-EIO);
hh = mISDN_HEAD_P(skb);
switch(hh->prim)
{
case PH_DATA | CONFIRM:
case DL_DATA | CONFIRM:
/* flush response, because no relation to upper layer */
dev_kfree_skb(skb);
break;
case PH_DATA | INDICATION:
case DL_DATA | INDICATION:
if (skb->len < 1)
return(-EINVAL);
/* decrypt if enabled */
if (dsp->bf_enable)
dsp_bf_decrypt(dsp, skb->data, skb->len);
/* if echo cancellation is enabled */
if (dsp->cancel_enable)
dsp_cancel_rx(dsp, skb->data, skb->len);
/* check if dtmf soft decoding is turned on */
if (dsp->dtmf.software) {
digits = dsp_dtmf_goertzel_decode(dsp, skb->data, skb->len, (dsp_options&DSP_OPT_ULAW)?1:0);
if (digits) while(*digits) {
if (dsp_debug & DEBUG_DSP_DTMF)
printk(KERN_DEBUG "%s: sending software decoded digit(%c) to upper layer %s\n", __FUNCTION__, *digits, dsp->inst.name);
cont = DTMF_TONE_VAL | *digits;
nskb = create_link_skb(PH_CONTROL | INDICATION, 0, sizeof(int), &cont, 0);
if (mISDN_queue_up(&dsp->inst, 0, nskb))
dev_kfree_skb(nskb);
digits++;
}
}
/* change volume if requested */
if (dsp->rx_volume)
dsp_change_volume(skb, dsp->rx_volume);
/* we need to process receive data if software */
spin_lock_irqsave(&dsp_obj.lock, flags);
if (dsp->pcm_slot_tx<0 && dsp->pcm_slot_rx<0) {
/* process data from card at cmx */
dsp_cmx_receive(dsp, skb);
}
spin_unlock_irqrestore(&dsp_obj.lock, flags);
if (dsp->rx_disabled) {
/* if receive is not allowed */
dev_kfree_skb(skb);
break;
}
hh->prim = DL_DATA | INDICATION;
ret = mISDN_queue_up(&dsp->inst, 0, skb);
break;
case PH_CONTROL | INDICATION:
if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
printk(KERN_DEBUG "%s: PH_CONTROL received: %x (len %d) %s\n", __FUNCTION__, hh->dinfo, skb->len, dsp->inst.name);
switch (hh->dinfo) {
case HW_HFC_COEFF: /* getting coefficients */
if (!dsp->dtmf.hardware) {
if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
printk(KERN_DEBUG "%s: ignoring DTMF coefficients from HFC\n", __FUNCTION__);
dev_kfree_skb(skb);
break;
}
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 %s\n", __FUNCTION__, *digits, dsp->inst.name);
k = *digits | DTMF_TONE_VAL;
nskb = create_link_skb(PH_CONTROL | INDICATION, 0, sizeof(int), &k, 0);
if (mISDN_queue_up(&dsp->inst, 0, nskb))
dev_kfree_skb(nskb);
digits++;
}
dev_kfree_skb(skb);
break;
case VOL_CHANGE_TX: /* change volume */
if (skb->len != sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->tx_volume = *((int *)skb->data);
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: change tx volume to %d\n", __FUNCTION__, dsp->tx_volume);
printk(KERN_DEBUG "%s: change tx volume to %d\n", __FUNCTION__, dsp->tx_volume);
dsp_cmx_hardware(dsp->conf, dsp);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: ctrl ind %x unhandled %s\n", __FUNCTION__, hh->dinfo, dsp->inst.name);
ret = -EINVAL;
}
break;
case PH_ACTIVATE | CONFIRM:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: b_channel is now active %s\n", __FUNCTION__, dsp->inst.name);
/* bchannel now active */
spin_lock_irqsave(&dsp_obj.lock, flags);
dsp->b_active = 1;
dsp->tx_W = dsp->tx_R = 0; /* clear TX buffer */
dsp->rx_W = dsp->rx_R = -1; /* reset RX buffer */
memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
dsp_cmx_hardware(dsp->conf, dsp);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: done with activation, sending confirm to user space. %s\n", __FUNCTION__, dsp->inst.name);
/* send activation to upper layer */
hh->prim = DL_ESTABLISH | CONFIRM;
ret = mISDN_queue_up(&dsp->inst, 0, skb);
break;
case PH_DEACTIVATE | CONFIRM:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: b_channel is now inactive %s\n", __FUNCTION__, dsp->inst.name);
/* bchannel now inactive */
spin_lock_irqsave(&dsp_obj.lock, flags);
dsp->b_active = 0;
dsp_cmx_hardware(dsp->conf, dsp);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
hh->prim = DL_RELEASE | CONFIRM;
ret = mISDN_queue_up(&dsp->inst, 0, skb);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: msg %x unhandled %s\n", __FUNCTION__, hh->prim, dsp->inst.name);
ret = -EINVAL;
}
return(ret);
}
/*
* messages from queue
*/
static int
dsp_function(mISDNinstance_t *inst, struct sk_buff *skb)
{
mISDN_head_t *hh;
int ret = -EINVAL;
hh = mISDN_HEAD_P(skb);
switch (hh->addr & MSG_DIR_MASK) {
case FLG_MSG_DOWN:
ret = dsp_from_up(inst, skb);
break;
case FLG_MSG_UP:
ret = dsp_from_down(inst, skb);
break;
}
return(ret);
}
/*
* desroy DSP instances
*/
static void
release_dsp(dsp_t *dsp)
{
mISDNinstance_t *inst = &dsp->inst;
conference_t *conf;
u_long flags;
spin_lock_irqsave(&dsp_obj.lock, flags);
if (timer_pending(&dsp->feature_tl))
del_timer(&dsp->feature_tl);
if (timer_pending(&dsp->tone.tl))
del_timer(&dsp->tone.tl);
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: removing conferences %s\n", __FUNCTION__, dsp->inst.name);
conf = dsp->conf;
if (conf) {
dsp_cmx_del_conf_member(dsp);
if (!list_empty(&conf->mlist)) {
dsp_cmx_del_conf(conf);
}
}
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: remove & destroy object %s\n", __FUNCTION__, dsp->inst.name);
list_del(&dsp->list);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
mISDN_ctrl(inst, MGR_UNREGLAYER | REQUEST, NULL);
vfree(dsp);
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: dsp instance released\n", __FUNCTION__);
}
/*
* ask for hardware features
*/
static void
dsp_feat(void *arg)
{
dsp_t *dsp = arg;
struct sk_buff *nskb;
void *feat;
switch (dsp->feature_state) {
case FEAT_STATE_INIT:
feat = &dsp->features;
nskb = create_link_skb(PH_CONTROL | REQUEST, HW_FEATURES, sizeof(feat), &feat, 0);
if (!nskb)
break;
if (mISDN_queue_down(&dsp->inst, 0, nskb)) {
dev_kfree_skb(nskb);
break;
}
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: features will be quered now for instance %s\n", __FUNCTION__, dsp->inst.name);
spin_lock(&dsp->feature_lock);
dsp->feature_state = FEAT_STATE_WAIT;
spin_unlock(&dsp->feature_lock);
init_timer(&dsp->feature_tl);
dsp->feature_tl.expires = jiffies + (HZ / 100);
add_timer(&dsp->feature_tl);
break;
case FEAT_STATE_WAIT:
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: features of %s are: hfc_id=%d hfc_dtmf=%d hfc_loops=%d hfc_echocanhw:%d pcm_id=%d pcm_slots=%d pcm_banks=%d\n",
__FUNCTION__, dsp->inst.name,
dsp->features.hfc_id,
dsp->features.hfc_dtmf,
dsp->features.hfc_loops,
dsp->features.hfc_echocanhw,
dsp->features.pcm_id,
dsp->features.pcm_slots,
dsp->features.pcm_banks);
spin_lock(&dsp->feature_lock);
dsp->feature_state = FEAT_STATE_RECEIVED;
spin_unlock(&dsp->feature_lock);
if (dsp->queue_conf_id) {
/* work on queued conf id*/
dsp_cmx_conf(dsp, dsp->queue_conf_id );
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
}
if (dsp->queue_dtmf) {
/* work on queued dtmf */
if (dsp->features.hfc_dtmf) {
dsp->dtmf.software = 0;
dsp->dtmf.hardware = 1;
} else {
dsp->dtmf.hardware = 0;
dsp->dtmf.software = 1;
}
}
if (dsp->queue_cancel[2]) {
dsp_cancel_init(dsp,
dsp->queue_cancel[0],
dsp->queue_cancel[1],
dsp->queue_cancel[2]
);
}
break;
}
}
/*
* create new DSP instances
*/
static int
new_dsp(mISDNstack_t *st, mISDN_pid_t *pid)
{
int err = 0;
dsp_t *ndsp;
u_long flags;
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: creating new dsp instance\n", __FUNCTION__);
if (!st || !pid)
return(-EINVAL);
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));
mISDN_init_instance(&ndsp->inst, &dsp_obj, ndsp, dsp_function);
if (!mISDN_SetHandledPID(&dsp_obj, &ndsp->inst.pid)) {
int_error();
err = -ENOPROTOOPT;
free_mem:
vfree(ndsp);
return(err);
}
sprintf(ndsp->inst.name, "DSP_S%x/C%x",
(st->id&0xff00)>>8, (st->id&0xff0000)>>16);
/* set frame size to start */
ndsp->features.hfc_id = -1; /* current PCM id */
ndsp->features.pcm_id = -1; /* current PCM id */
ndsp->pcm_slot_rx = -1; /* current CPM slot */
ndsp->pcm_slot_tx = -1;
ndsp->pcm_bank_rx = -1;
ndsp->pcm_bank_tx = -1;
ndsp->hfc_conf = -1; /* current conference number */
/* set tone timer */
ndsp->tone.tl.function = (void *)dsp_tone_timeout;
ndsp->tone.tl.data = (long) ndsp;
init_timer(&ndsp->tone.tl);
/* set dsp feture timer */
ndsp->feature_tl.function = (void *)dsp_feat;
ndsp->feature_tl.data = (long) ndsp;
ndsp->feature_state = FEAT_STATE_INIT;
if (dtmfthreshold < 20 || dtmfthreshold> 500) {
dtmfthreshold=200;
}
#warning CHRISTIAN: my define was 200000, but your default is 200*10000=2000000. what shall we do? *1000 or dtmftreshold=20 ??
ndsp->dtmf.treshold=dtmfthreshold*10000;
spin_lock_init(&ndsp->feature_lock);
init_timer(&ndsp->feature_tl);
if (!(dsp_options & DSP_OPT_NOHARDWARE)) {
ndsp->feature_tl.expires = jiffies + (HZ / 100);
add_timer(&ndsp->feature_tl);
}
spin_lock_irqsave(&dsp_obj.lock, flags);
/* append and register */
list_add_tail(&ndsp->list, &dsp_obj.ilist);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
err = mISDN_ctrl(st, MGR_REGLAYER | INDICATION, &ndsp->inst);
if (err) {
printk(KERN_ERR "%s: failed to register layer %s\n", __FUNCTION__, ndsp->inst.name);
spin_lock_irqsave(&dsp_obj.lock, flags);
list_del(&ndsp->list);
spin_unlock_irqrestore(&dsp_obj.lock, flags);
goto free_mem;
}
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: dsp instance created %s\n", __FUNCTION__, ndsp->inst.name);
return(err);
}
/*
* manager for DSP instances
*/
static int
dsp_manager(void *data, u_int prim, void *arg) {
mISDNinstance_t *inst = data;
dsp_t *dspl;
int ret = -EINVAL;
u_long flags;
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: data:%p prim:%x arg:%p\n", __FUNCTION__, data, prim, arg);
if (!data)
return(ret);
spin_lock_irqsave(&dsp_obj.lock, flags);
list_for_each_entry(dspl, &dsp_obj.ilist, list) {
if (&dspl->inst == inst) {
ret = 0;
break;
}
}
spin_unlock_irqrestore(&dsp_obj.lock, flags);
if (ret && (prim != (MGR_NEWLAYER | REQUEST))) {
printk(KERN_WARNING "%s: given instance(%p) not in ilist.\n", __FUNCTION__, data);
return(ret);
}
switch(prim) {
case MGR_NEWLAYER | REQUEST:
ret = new_dsp(data, arg);
break;
case MGR_SETSTACK | INDICATION:
break;
#ifdef OBSOLETE
case MGR_CONNECT | REQUEST:
ret = mISDN_ConnectIF(inst, arg);
break;
case MGR_SETIF | REQUEST:
case MGR_SETIF | INDICATION:
ret = mISDN_SetIF(inst, arg, prim, dsp_from_up, dsp_from_down, dspl);
break;
case MGR_DISCONNECT | REQUEST:
case MGR_DISCONNECT | INDICATION:
ret = mISDN_DisConnectIF(inst, arg);
break;
#endif
case MGR_UNREGLAYER | REQUEST:
case MGR_RELEASE | INDICATION:
if (dsp_debug & DEBUG_DSP_MGR)
printk(KERN_DEBUG "%s: release_dsp id %x\n", __FUNCTION__, dspl->inst.st->id);
release_dsp(dspl);
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;
/* copy variables */
dsp_options = options;
dsp_debug = debug;
/* display revision */
printk(KERN_INFO "mISDN_dsp: Audio DSP Rev. %s (debug=0x%x) EchoCancellor %s dtmfthreshold(%d)\n", mISDN_getrev(dsp_revision), debug, EC_TYPE, dtmfthreshold);
/* set packet size */
if (poll == 0) {
if (HZ == 100)
poll = 80;
else
poll = 64;
}
if (poll > MAX_POLL) {
printk(KERN_ERR "%s: Wrong poll value (%d), using %d.\n", __FUNCTION__, poll, MAX_POLL);
poll = MAX_POLL;
}
if (poll < 8) {
printk(KERN_ERR "%s: Wrong poll value (%d), using 8.\n", __FUNCTION__, poll);
poll = 8;
}
dsp_poll = poll;
dsp_tics = poll * HZ / 8000;
if (dsp_tics * 8000 == poll * HZ)
printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals %d jiffies.\n", poll, dsp_tics);
else {
printk(KERN_INFO "mISDN_dsp: Cannot clock ever %d samples. Use a multiple of %d (samples)\n", poll, 8000 / HZ);
err = -EINVAL;
return(err);
}
/* fill mISDN object (dsp_obj) */
memset(&dsp_obj, 0, sizeof(dsp_obj));
#ifdef MODULE
SET_MODULE_OWNER(&dsp_obj);
#endif
spin_lock_init(&dsp_obj.lock);
dsp_obj.name = DSPName;
dsp_obj.BPROTO.protocol[3] = ISDN_PID_L3_B_DSP;
dsp_obj.own_ctrl = dsp_manager;
INIT_LIST_HEAD(&dsp_obj.ilist);
/* initialize audio tables */
dsp_silence = (dsp_options&DSP_OPT_ULAW)?0xff:0x2a;
dsp_audio_law_to_s32 = (dsp_options&DSP_OPT_ULAW)?dsp_audio_ulaw_to_s32:dsp_audio_alaw_to_s32;
dsp_audio_generate_s2law_table();
dsp_audio_generate_seven();
dsp_audio_generate_mix_table();
if (dsp_options & DSP_OPT_ULAW)
dsp_audio_generate_ulaw_samples();
dsp_audio_generate_volume_changes();
/* register object */
if ((err = mISDN_register(&dsp_obj))) {
printk(KERN_ERR "mISDN_dsp: Can't register %s error(%d)\n", DSPName, err);
return(err);
}
/* set sample timer */
dsp_spl_tl.function = (void *)dsp_cmx_send;
dsp_spl_tl.data = 0;
init_timer(&dsp_spl_tl);
dsp_spl_tl.expires = jiffies + dsp_tics + 1; /* safer */
dsp_spl_jiffies = dsp_spl_tl.expires;
add_timer(&dsp_spl_tl);
mISDN_module_register(THIS_MODULE);
return(0);
}
/*
* cleanup DSP object during module removal
*/
static void dsp_cleanup(void)
{
dsp_t *dspl, *nd;
int err;
mISDN_module_unregister(THIS_MODULE);
if (timer_pending(&dsp_spl_tl))
del_timer(&dsp_spl_tl);
if (dsp_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 (!list_empty(&dsp_obj.ilist)) {
printk(KERN_WARNING "mISDN_dsp: Audio DSP object inst list not empty.\n");
list_for_each_entry_safe(dspl, nd, &dsp_obj.ilist, list)
release_dsp(dspl);
}
if (!list_empty(&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
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