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linux/drivers/isdn/mISDN/dsp_core.c
Konstantin Khlebnikov 4a0ae7b0a9 mISDN: fix race in timer canceling on module unloading 
Using timer_pending() without additional syncronization is racy,
del_timer_sync() must be used here for waiting in-flight handler.
Bug caught with help from "debug-objects" during random insmod/rmmod.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-14 13:14:07 -05:00

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/*
* 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 (clocking)
* - (4) echo generation for delay test
* - (5) volume control
* - (6) disable receive data
* - (7) pipeline
* - (8) encryption/decryption
*
* Look:
* TX RX
* ------upper layer------
* | ^
* | |(6)
* v |
* +-----+-------------+-----+
* |(3)(4) |
* | CMX |
* | |
* | +-------------+
* | | ^
* | | |
* |+---------+| +----+----+
* ||(1) || |(2) |
* || || | |
* || Tones || | DTMF |
* || || | |
* || || | |
* |+----+----+| +----+----+
* +-----+-----+ ^
* | |
* v |
* +----+----+ +----+----+
* |(5) | |(5) |
* | | | |
* |TX Volume| |RX Volume|
* | | | |
* | | | |
* +----+----+ +----+----+
* | ^
* | |
* v |
* +----+-------------+----+
* |(7) |
* | |
* | Pipeline Processing |
* | |
* | |
* +----+-------------+----+
* | ^
* | |
* 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 performance 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 losing
* 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 useful if only announcements are played. Not sending is
* useful if an answering machine records audio. Not sending and receiving is
* useful 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. This lock MUST lock irq, because it
* must lock timer events by DSP poll timer.
* When data is ready to be transmitted down, the data is queued and sent
* outside lock and timer event.
* PH_CONTROL must not change any settings, join or split conference members
* during process of data.
*
* HDLC:
*
* It works quite the same as transparent, except that HDLC data is forwarded
* to all other conference members if no hardware bridging is possible.
* Send data will be writte to sendq. Sendq will be sent if confirm is received.
* Conference cannot join, if one member is not hdlc.
*
*/
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/mISDNif.h>
#include <linux/mISDNdsp.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include "core.h"
#include "dsp.h"
static const char *mISDN_dsp_revision = "2.0";
static int debug;
static int options;
static int poll;
static int dtmfthreshold = 100;
MODULE_AUTHOR("Andreas Eversberg");
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);
MODULE_LICENSE("GPL");
/*int spinnest = 0;*/
spinlock_t dsp_lock; /* global dsp lock */
struct list_head dsp_ilist;
struct list_head conf_ilist;
int dsp_debug;
int dsp_options;
int dsp_poll, dsp_tics;
/* check if rx may be turned off or must be turned on */
static void
dsp_rx_off_member(struct dsp *dsp)
{
struct mISDN_ctrl_req cq;
int rx_off = 1;
memset(&cq, 0, sizeof(cq));
if (!dsp->features_rx_off)
return;
/* not disabled */
if (!dsp->rx_disabled)
rx_off = 0;
/* software dtmf */
else if (dsp->dtmf.software)
rx_off = 0;
/* echo in software */
else if (dsp->echo.software)
rx_off = 0;
/* bridge in software */
else if (dsp->conf && dsp->conf->software)
rx_off = 0;
/* data is not required by user space and not required
* for echo dtmf detection, soft-echo, soft-bridging */
if (rx_off == dsp->rx_is_off)
return;
if (!dsp->ch.peer) {
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: no peer, no rx_off\n",
__func__);
return;
}
cq.op = MISDN_CTRL_RX_OFF;
cq.p1 = rx_off;
if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
__func__);
return;
}
dsp->rx_is_off = rx_off;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
__func__, dsp->name, rx_off);
}
static void
dsp_rx_off(struct dsp *dsp)
{
struct dsp_conf_member *member;
if (dsp_options & DSP_OPT_NOHARDWARE)
return;
/* no conf */
if (!dsp->conf) {
dsp_rx_off_member(dsp);
return;
}
/* check all members in conf */
list_for_each_entry(member, &dsp->conf->mlist, list) {
dsp_rx_off_member(member->dsp);
}
}
/* enable "fill empty" feature */
static void
dsp_fill_empty(struct dsp *dsp)
{
struct mISDN_ctrl_req cq;
memset(&cq, 0, sizeof(cq));
if (!dsp->ch.peer) {
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
__func__);
return;
}
cq.op = MISDN_CTRL_FILL_EMPTY;
cq.p1 = 1;
cq.p2 = dsp_silence;
if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
__func__);
return;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
__func__, dsp->name);
}
static int
dsp_control_req(struct dsp *dsp, struct mISDNhead *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", __func__);
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->hdlc) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: start dtmf\n", __func__);
if (len == sizeof(int)) {
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_NOTICE "changing DTMF Threshold "
"to %d\n", *((int *)data));
dsp->dtmf.treshold = (*(int *)data) * 10000;
}
dsp->dtmf.enable = 1;
/* init goertzel */
dsp_dtmf_goertzel_init(dsp);
/* check dtmf hardware */
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
break;
case DTMF_TONE_STOP: /* turn off DTMF */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
dsp->dtmf.enable = 0;
dsp->dtmf.hardware = 0;
dsp->dtmf.software = 0;
break;
case DSP_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",
__func__, *((u32 *)data));
ret = dsp_cmx_conf(dsp, *((u32 *)data));
/* dsp_cmx_hardware will also be called here */
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_CONF_SPLIT: /* remove from conference */
conf_split:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: release conference\n", __func__);
ret = dsp_cmx_conf(dsp, 0);
/* dsp_cmx_hardware will also be called here */
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
dsp_rx_off(dsp);
break;
case DSP_TONE_PATT_ON: /* play tone */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (len < sizeof(int)) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
__func__, *((int *)skb->data));
ret = dsp_tone(dsp, *((int *)data));
if (!ret) {
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
}
if (!dsp->tone.tone)
goto tone_off;
break;
case DSP_TONE_PATT_OFF: /* stop tone */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn tone off\n", __func__);
dsp_tone(dsp, 0);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
/* reset tx buffers (user space data) */
tone_off:
dsp->rx_W = 0;
dsp->rx_R = 0;
break;
case DSP_VOL_CHANGE_TX: /* change volume */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (len < sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->tx_volume = *((int *)data);
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: change tx vol to %d\n",
__func__, dsp->tx_volume);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
break;
case DSP_VOL_CHANGE_RX: /* change volume */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (len < sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->rx_volume = *((int *)data);
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: change rx vol to %d\n",
__func__, dsp->tx_volume);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
break;
case DSP_ECHO_ON: /* enable echo */
dsp->echo.software = 1; /* soft echo */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_ECHO_OFF: /* disable echo */
dsp->echo.software = 0;
dsp->echo.hardware = 0;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_RECEIVE_ON: /* enable receive to user space */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable receive to user "
"space\n", __func__);
dsp->rx_disabled = 0;
dsp_rx_off(dsp);
break;
case DSP_RECEIVE_OFF: /* disable receive to user space */
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable receive to "
"user space\n", __func__);
dsp->rx_disabled = 1;
dsp_rx_off(dsp);
break;
case DSP_MIX_ON: /* enable mixing of tx data */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable mixing of "
"tx-data with conf mebers\n", __func__);
dsp->tx_mix = 1;
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_MIX_OFF: /* disable mixing of tx data */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable mixing of "
"tx-data with conf mebers\n", __func__);
dsp->tx_mix = 0;
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_TXDATA_ON: /* enable txdata */
dsp->tx_data = 1;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_TXDATA_OFF: /* disable txdata */
dsp->tx_data = 0;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
if (dsp_debug & DEBUG_DSP_CMX)
dsp_cmx_debug(dsp);
break;
case DSP_DELAY: /* use delay algorithm instead of dynamic
jitter algorithm */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (len < sizeof(int)) {
ret = -EINVAL;
break;
}
dsp->cmx_delay = (*((int *)data)) << 3;
/* milliseconds to samples */
if (dsp->cmx_delay >= (CMX_BUFF_HALF >> 1))
/* clip to half of maximum usable buffer
(half of half buffer) */
dsp->cmx_delay = (CMX_BUFF_HALF >> 1) - 1;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: use delay algorithm to "
"compensate jitter (%d samples)\n",
__func__, dsp->cmx_delay);
break;
case DSP_JITTER: /* use dynamic jitter algorithm instead of
delay algorithm */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
dsp->cmx_delay = 0;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: use jitter algorithm to "
"compensate jitter\n", __func__);
break;
case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
dsp->tx_dejitter = 1;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: use dejitter on TX "
"buffer\n", __func__);
break;
case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
dsp->tx_dejitter = 0;
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: use TX buffer without "
"dejittering\n", __func__);
break;
case DSP_PIPELINE_CFG:
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (len > 0 && ((char *)data)[len - 1]) {
printk(KERN_DEBUG "%s: pipeline config string "
"is not NULL terminated!\n", __func__);
ret = -EINVAL;
} else {
dsp->pipeline.inuse = 1;
dsp_cmx_hardware(dsp->conf, dsp);
ret = dsp_pipeline_build(&dsp->pipeline,
len > 0 ? data : NULL);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
}
break;
case DSP_BF_ENABLE_KEY: /* turn blowfish on */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
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", __func__);
ret = dsp_bf_init(dsp, (u8 *)data, len);
/* set new cont */
if (!ret)
cont = DSP_BF_ACCEPT;
else
cont = DSP_BF_REJECT;
/* send indication if it worked to set it */
nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
sizeof(int), &cont, GFP_ATOMIC);
if (nskb) {
if (dsp->up) {
if (dsp->up->send(dsp->up, nskb))
dev_kfree_skb(nskb);
} else
dev_kfree_skb(nskb);
}
if (!ret) {
dsp_cmx_hardware(dsp->conf, dsp);
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
}
break;
case DSP_BF_DISABLE: /* turn blowfish off */
if (dsp->hdlc) {
ret = -EINVAL;
break;
}
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
dsp_bf_cleanup(dsp);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
__func__, cont);
ret = -EINVAL;
}
return ret;
}
static void
get_features(struct mISDNchannel *ch)
{
struct dsp *dsp = container_of(ch, struct dsp, ch);
struct mISDN_ctrl_req cq;
if (!ch->peer) {
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: no peer, no features\n",
__func__);
return;
}
memset(&cq, 0, sizeof(cq));
cq.op = MISDN_CTRL_GETOP;
if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
__func__);
return;
}
if (cq.op & MISDN_CTRL_RX_OFF)
dsp->features_rx_off = 1;
if (cq.op & MISDN_CTRL_FILL_EMPTY)
dsp->features_fill_empty = 1;
if (dsp_options & DSP_OPT_NOHARDWARE)
return;
if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
cq.op = MISDN_CTRL_HW_FEATURES;
*((u_long *)&cq.p1) = (u_long)&dsp->features;
if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
__func__);
}
} else
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: features not supported for %s\n",
__func__, dsp->name);
}
static int
dsp_function(struct mISDNchannel *ch, struct sk_buff *skb)
{
struct dsp *dsp = container_of(ch, struct dsp, ch);
struct mISDNhead *hh;
int ret = 0;
u8 *digits = NULL;
u_long flags;
hh = mISDN_HEAD_P(skb);
switch (hh->prim) {
/* FROM DOWN */
case (PH_DATA_CNF):
dsp->data_pending = 0;
/* trigger next hdlc frame, if any */
if (dsp->hdlc) {
spin_lock_irqsave(&dsp_lock, flags);
if (dsp->b_active)
schedule_work(&dsp->workq);
spin_unlock_irqrestore(&dsp_lock, flags);
}
break;
case (PH_DATA_IND):
case (DL_DATA_IND):
if (skb->len < 1) {
ret = -EINVAL;
break;
}
if (dsp->rx_is_off) {
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: rx-data during rx_off"
" for %s\n",
__func__, dsp->name);
}
if (dsp->hdlc) {
/* hdlc */
spin_lock_irqsave(&dsp_lock, flags);
dsp_cmx_hdlc(dsp, skb);
spin_unlock_irqrestore(&dsp_lock, flags);
if (dsp->rx_disabled) {
/* if receive is not allowed */
break;
}
hh->prim = DL_DATA_IND;
if (dsp->up)
return dsp->up->send(dsp->up, skb);
break;
}
spin_lock_irqsave(&dsp_lock, flags);
/* decrypt if enabled */
if (dsp->bf_enable)
dsp_bf_decrypt(dsp, skb->data, skb->len);
/* pipeline */
if (dsp->pipeline.inuse)
dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
skb->len, hh->id);
/* change volume if requested */
if (dsp->rx_volume)
dsp_change_volume(skb, dsp->rx_volume);
/* 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);
}
/* we need to process receive data if software */
if (dsp->conf && dsp->conf->software) {
/* process data from card at cmx */
dsp_cmx_receive(dsp, skb);
}
spin_unlock_irqrestore(&dsp_lock, flags);
/* send dtmf result, if any */
if (digits) {
while (*digits) {
int k;
struct sk_buff *nskb;
if (dsp_debug & DEBUG_DSP_DTMF)
printk(KERN_DEBUG "%s: digit"
"(%c) to layer %s\n",
__func__, *digits, dsp->name);
k = *digits | DTMF_TONE_VAL;
nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
MISDN_ID_ANY, sizeof(int), &k,
GFP_ATOMIC);
if (nskb) {
if (dsp->up) {
if (dsp->up->send(
dsp->up, nskb))
dev_kfree_skb(nskb);
} else
dev_kfree_skb(nskb);
}
digits++;
}
}
if (dsp->rx_disabled) {
/* if receive is not allowed */
break;
}
hh->prim = DL_DATA_IND;
if (dsp->up)
return dsp->up->send(dsp->up, skb);
break;
case (PH_CONTROL_IND):
if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
"received: %x (len %d) %s\n", __func__,
hh->id, skb->len, dsp->name);
switch (hh->id) {
case (DTMF_HFC_COEF): /* getting coefficients */
if (!dsp->dtmf.hardware) {
if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
printk(KERN_DEBUG "%s: ignoring DTMF "
"coefficients from HFC\n",
__func__);
break;
}
digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
skb->len, 2);
while (*digits) {
int k;
struct sk_buff *nskb;
if (dsp_debug & DEBUG_DSP_DTMF)
printk(KERN_DEBUG "%s: digit"
"(%c) to layer %s\n",
__func__, *digits, dsp->name);
k = *digits | DTMF_TONE_VAL;
nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
MISDN_ID_ANY, sizeof(int), &k,
GFP_ATOMIC);
if (nskb) {
if (dsp->up) {
if (dsp->up->send(
dsp->up, nskb))
dev_kfree_skb(nskb);
} else
dev_kfree_skb(nskb);
}
digits++;
}
break;
case (HFC_VOL_CHANGE_TX): /* change volume */
if (skb->len != sizeof(int)) {
ret = -EINVAL;
break;
}
spin_lock_irqsave(&dsp_lock, flags);
dsp->tx_volume = *((int *)skb->data);
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: change tx volume to "
"%d\n", __func__, dsp->tx_volume);
dsp_cmx_hardware(dsp->conf, dsp);
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
spin_unlock_irqrestore(&dsp_lock, flags);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
"%s\n", __func__, hh->id, dsp->name);
ret = -EINVAL;
}
break;
case (PH_ACTIVATE_IND):
case (PH_ACTIVATE_CNF):
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: b_channel is now active %s\n",
__func__, dsp->name);
/* bchannel now active */
spin_lock_irqsave(&dsp_lock, flags);
dsp->b_active = 1;
dsp->data_pending = 0;
dsp->rx_init = 1;
/* rx_W and rx_R will be adjusted on first frame */
dsp->rx_W = 0;
dsp->rx_R = 0;
memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
dsp_cmx_hardware(dsp->conf, dsp);
dsp_dtmf_hardware(dsp);
dsp_rx_off(dsp);
spin_unlock_irqrestore(&dsp_lock, flags);
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: done with activation, sending "
"confirm to user space. %s\n", __func__,
dsp->name);
/* send activation to upper layer */
hh->prim = DL_ESTABLISH_CNF;
if (dsp->up)
return dsp->up->send(dsp->up, skb);
break;
case (PH_DEACTIVATE_IND):
case (PH_DEACTIVATE_CNF):
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
__func__, dsp->name);
/* bchannel now inactive */
spin_lock_irqsave(&dsp_lock, flags);
dsp->b_active = 0;
dsp->data_pending = 0;
dsp_cmx_hardware(dsp->conf, dsp);
dsp_rx_off(dsp);
spin_unlock_irqrestore(&dsp_lock, flags);
hh->prim = DL_RELEASE_CNF;
if (dsp->up)
return dsp->up->send(dsp->up, skb);
break;
/* FROM UP */
case (DL_DATA_REQ):
case (PH_DATA_REQ):
if (skb->len < 1) {
ret = -EINVAL;
break;
}
if (dsp->hdlc) {
/* hdlc */
if (!dsp->b_active) {
ret = -EIO;
break;
}
hh->prim = PH_DATA_REQ;
spin_lock_irqsave(&dsp_lock, flags);
skb_queue_tail(&dsp->sendq, skb);
schedule_work(&dsp->workq);
spin_unlock_irqrestore(&dsp_lock, flags);
return 0;
}
/* send data to tx-buffer (if no tone is played) */
if (!dsp->tone.tone) {
spin_lock_irqsave(&dsp_lock, flags);
dsp_cmx_transmit(dsp, skb);
spin_unlock_irqrestore(&dsp_lock, flags);
}
break;
case (PH_CONTROL_REQ):
spin_lock_irqsave(&dsp_lock, flags);
ret = dsp_control_req(dsp, hh, skb);
spin_unlock_irqrestore(&dsp_lock, flags);
break;
case (DL_ESTABLISH_REQ):
case (PH_ACTIVATE_REQ):
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: activating b_channel %s\n",
__func__, dsp->name);
if (dsp->dtmf.hardware || dsp->dtmf.software)
dsp_dtmf_goertzel_init(dsp);
get_features(ch);
/* enable fill_empty feature */
if (dsp->features_fill_empty)
dsp_fill_empty(dsp);
/* send ph_activate */
hh->prim = PH_ACTIVATE_REQ;
if (ch->peer)
return ch->recv(ch->peer, skb);
break;
case (DL_RELEASE_REQ):
case (PH_DEACTIVATE_REQ):
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: releasing b_channel %s\n",
__func__, dsp->name);
spin_lock_irqsave(&dsp_lock, flags);
dsp->tone.tone = 0;
dsp->tone.hardware = 0;
dsp->tone.software = 0;
if (timer_pending(&dsp->tone.tl))
del_timer(&dsp->tone.tl);
if (dsp->conf)
dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
called here */
skb_queue_purge(&dsp->sendq);
spin_unlock_irqrestore(&dsp_lock, flags);
hh->prim = PH_DEACTIVATE_REQ;
if (ch->peer)
return ch->recv(ch->peer, skb);
break;
default:
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
__func__, hh->prim, dsp->name);
ret = -EINVAL;
}
if (!ret)
dev_kfree_skb(skb);
return ret;
}
static int
dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
{
struct dsp *dsp = container_of(ch, struct dsp, ch);
u_long flags;
int err = 0;
if (debug & DEBUG_DSP_CTRL)
printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
switch (cmd) {
case OPEN_CHANNEL:
break;
case CLOSE_CHANNEL:
if (dsp->ch.peer)
dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
/* wait until workqueue has finished,
* must lock here, or we may hit send-process currently
* queueing. */
spin_lock_irqsave(&dsp_lock, flags);
dsp->b_active = 0;
spin_unlock_irqrestore(&dsp_lock, flags);
/* MUST not be locked, because it waits until queue is done. */
cancel_work_sync(&dsp->workq);
spin_lock_irqsave(&dsp_lock, flags);
if (timer_pending(&dsp->tone.tl))
del_timer(&dsp->tone.tl);
skb_queue_purge(&dsp->sendq);
if (dsp_debug & DEBUG_DSP_CTRL)
printk(KERN_DEBUG "%s: releasing member %s\n",
__func__, dsp->name);
dsp->b_active = 0;
dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
here */
dsp_pipeline_destroy(&dsp->pipeline);
if (dsp_debug & DEBUG_DSP_CTRL)
printk(KERN_DEBUG "%s: remove & destroy object %s\n",
__func__, dsp->name);
list_del(&dsp->list);
spin_unlock_irqrestore(&dsp_lock, flags);
if (dsp_debug & DEBUG_DSP_CTRL)
printk(KERN_DEBUG "%s: dsp instance released\n",
__func__);
vfree(dsp);
module_put(THIS_MODULE);
break;
}
return err;
}
static void
dsp_send_bh(struct work_struct *work)
{
struct dsp *dsp = container_of(work, struct dsp, workq);
struct sk_buff *skb;
struct mISDNhead *hh;
if (dsp->hdlc && dsp->data_pending)
return; /* wait until data has been acknowledged */
/* send queued data */
while ((skb = skb_dequeue(&dsp->sendq))) {
/* in locked date, we must have still data in queue */
if (dsp->data_pending) {
if (dsp_debug & DEBUG_DSP_CORE)
printk(KERN_DEBUG "%s: fifo full %s, this is "
"no bug!\n", __func__, dsp->name);
/* flush transparent data, if not acked */
dev_kfree_skb(skb);
continue;
}
hh = mISDN_HEAD_P(skb);
if (hh->prim == DL_DATA_REQ) {
/* send packet up */
if (dsp->up) {
if (dsp->up->send(dsp->up, skb))
dev_kfree_skb(skb);
} else
dev_kfree_skb(skb);
} else {
/* send packet down */
if (dsp->ch.peer) {
dsp->data_pending = 1;
if (dsp->ch.recv(dsp->ch.peer, skb)) {
dev_kfree_skb(skb);
dsp->data_pending = 0;
}
} else
dev_kfree_skb(skb);
}
}
}
static int
dspcreate(struct channel_req *crq)
{
struct dsp *ndsp;
u_long flags;
if (crq->protocol != ISDN_P_B_L2DSP
&& crq->protocol != ISDN_P_B_L2DSPHDLC)
return -EPROTONOSUPPORT;
ndsp = vzalloc(sizeof(struct dsp));
if (!ndsp) {
printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
return -ENOMEM;
}
if (dsp_debug & DEBUG_DSP_CTRL)
printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
/* default enabled */
INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
skb_queue_head_init(&ndsp->sendq);
ndsp->ch.send = dsp_function;
ndsp->ch.ctrl = dsp_ctrl;
ndsp->up = crq->ch;
crq->ch = &ndsp->ch;
if (crq->protocol == ISDN_P_B_L2DSP) {
crq->protocol = ISDN_P_B_RAW;
ndsp->hdlc = 0;
} else {
crq->protocol = ISDN_P_B_HDLC;
ndsp->hdlc = 1;
}
if (!try_module_get(THIS_MODULE))
printk(KERN_WARNING "%s:cannot get module\n",
__func__);
sprintf(ndsp->name, "DSP_C%x(0x%p)",
ndsp->up->st->dev->id + 1, ndsp);
/* 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);
if (dtmfthreshold < 20 || dtmfthreshold > 500)
dtmfthreshold = 200;
ndsp->dtmf.treshold = dtmfthreshold * 10000;
/* init pipeline append to list */
spin_lock_irqsave(&dsp_lock, flags);
dsp_pipeline_init(&ndsp->pipeline);
list_add_tail(&ndsp->list, &dsp_ilist);
spin_unlock_irqrestore(&dsp_lock, flags);
return 0;
}
static struct Bprotocol DSP = {
.Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
| (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
.name = "dsp",
.create = dspcreate
};
static int __init dsp_init(void)
{
int err;
int tics;
printk(KERN_INFO "DSP module %s\n", mISDN_dsp_revision);
dsp_options = options;
dsp_debug = debug;
/* set packet size */
dsp_poll = poll;
if (dsp_poll) {
if (dsp_poll > MAX_POLL) {
printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
"maximum.\n", __func__, poll, MAX_POLL);
err = -EINVAL;
return err;
}
if (dsp_poll < 8) {
printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
"minimum.\n", __func__, dsp_poll);
err = -EINVAL;
return err;
}
dsp_tics = poll * HZ / 8000;
if (dsp_tics * 8000 != poll * HZ) {
printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
"samples (0,125 ms). It is not a multiple of "
"%d HZ.\n", poll, HZ);
err = -EINVAL;
return err;
}
} else {
poll = 8;
while (poll <= MAX_POLL) {
tics = (poll * HZ) / 8000;
if (tics * 8000 == poll * HZ) {
dsp_tics = tics;
dsp_poll = poll;
if (poll >= 64)
break;
}
poll++;
}
}
if (dsp_poll == 0) {
printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
"clock that equals exactly the duration of 8-256 "
"samples. (Choose kernel clock speed like 100, 250, "
"300, 1000)\n");
err = -EINVAL;
return err;
}
printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
"%d jiffies.\n", dsp_poll, dsp_tics);
spin_lock_init(&dsp_lock);
INIT_LIST_HEAD(&dsp_ilist);
INIT_LIST_HEAD(&conf_ilist);
/* init conversion tables */
dsp_audio_generate_law_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();
err = dsp_pipeline_module_init();
if (err) {
printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
"error(%d)\n", err);
return err;
}
err = mISDN_register_Bprotocol(&DSP);
if (err) {
printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, 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;
dsp_spl_jiffies = dsp_spl_tl.expires;
add_timer(&dsp_spl_tl);
return 0;
}
static void __exit dsp_cleanup(void)
{
mISDN_unregister_Bprotocol(&DSP);
del_timer_sync(&dsp_spl_tl);
if (!list_empty(&dsp_ilist)) {
printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
"empty.\n");
}
if (!list_empty(&conf_ilist)) {
printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
"all memory freed.\n");
}
dsp_pipeline_module_exit();
}
module_init(dsp_init);
module_exit(dsp_cleanup);
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