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dahdi: Provide notification when preechocan buffer is created and destroyed.

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Not quite ideal, but this seems to be the most straightforward way to
know when someone is trying to monitor the preec stream on a channel.
This callback allows the board driver providing the span an opportunity
to setup the hardware preecho monitoring as needed.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9942 a0bf4364-ded3-4de4-8d8a-66a801d63aff
This commit is contained in:
Shaun Ruffell 2011-06-02 20:01:44 +00:00
parent dd33d6c357
commit 93a7adfb9f
2 changed files with 141 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

164
drivers/dahdi/dahdi-base.c
View File

@ -1343,6 +1343,75 @@ static inline bool is_gain_allocated(const struct dahdi_chan *chan)
return (chan->rxgain && (chan->rxgain != defgain));
}
static const char *hwec_def_name = "HWEC";
static const char *hwec_get_name(const struct dahdi_chan *chan)
{
if (chan && chan->span && chan->span->ops->echocan_name)
return chan->span->ops->echocan_name(chan);
else
return hwec_def_name;
}
static int hwec_echocan_create(struct dahdi_chan *chan,
struct dahdi_echocanparams *ecp, struct dahdi_echocanparam *p,
struct dahdi_echocan_state **ec)
{
if (chan->span && chan->span->ops->echocan_create)
return chan->span->ops->echocan_create(chan, ecp, p, ec);
else
return -ENODEV;
}
static const struct dahdi_echocan_factory hwec_factory = {
.get_name = hwec_get_name,
.owner = THIS_MODULE,
.echocan_create = hwec_echocan_create,
};
/**
* dahdi_enable_hw_preechocan - Let the board driver enable hwpreec if possible.
* @chan: The channel to monitor.
*
* Returns 0 on success, if there is a software echocanceler attached on
* the channel, or the span does not have an enable_hw_preechocan callback.
* Otherwise an error code.
*
*/
static int dahdi_enable_hw_preechocan(struct dahdi_chan *chan)
{
int res;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
if (chan->ec_factory != &hwec_factory)
res = -ENODEV;
else
res = 0;
spin_unlock_irqrestore(&chan->lock, flags);
if (-ENODEV == res)
return 0;
if (chan->span->ops->enable_hw_preechocan)
return chan->span->ops->enable_hw_preechocan(chan);
else
return 0;
}
/**
* dahdi_disable_hw_preechocan - Disable any hardware pre echocan monitoring.
* @chan: The channel to stop monitoring.
*
* Give the board driver the option to free any resources needed to monitor
* the preechocan stream.
*
*/
static void dahdi_disable_hw_preechocan(struct dahdi_chan *chan)
{
if (chan->span->ops->disable_hw_preechocan)
chan->span->ops->disable_hw_preechocan(chan);
}
/*
* close_channel - close the channel, resetting any channel variables
* @chan: the dahdi_chan to close
@ -1366,6 +1435,23 @@ static void close_channel(struct dahdi_chan *chan)
might_sleep();
if (chan->conf_chan &&
((DAHDI_CONF_MONITOR_RX_PREECHO == chan->confmode) ||
(DAHDI_CONF_MONITOR_TX_PREECHO == chan->confmode) ||
(DAHDI_CONF_MONITORBOTH_PREECHO == chan->confmode))) {
void *readchunkpreec;
spin_lock_irqsave(&chan->conf_chan->lock, flags);
readchunkpreec = chan->conf_chan->readchunkpreec;
chan->conf_chan->readchunkpreec = NULL;
spin_unlock_irqrestore(&chan->conf_chan->lock, flags);
if (readchunkpreec) {
dahdi_disable_hw_preechocan(chan->conf_chan);
kfree(readchunkpreec);
}
}
/* XXX Buffers should be send out before reallocation!!! XXX */
if (!(chan->flags & DAHDI_FLAG_NOSTDTXRX))
dahdi_reallocbufs(chan, 0, 0);
@ -1443,8 +1529,11 @@ static void close_channel(struct dahdi_chan *chan)
if (rxgain)
kfree(rxgain);
if (readchunkpreec)
if (readchunkpreec) {
dahdi_disable_hw_preechocan(chan);
kfree(readchunkpreec);
}
#ifdef CONFIG_DAHDI_PPP
if (ppp) {
@ -5108,6 +5197,7 @@ static int dahdi_ioctl_setconf(struct file *file, unsigned long data)
unsigned long flags;
unsigned int confmode;
int oldconf;
enum {NONE, ENABLE_HWPREEC, DISABLE_HWPREEC} preec = NONE;
if (copy_from_user(&conf, (void __user *)data, sizeof(conf)))
return -EFAULT;
@ -5184,21 +5274,50 @@ static int dahdi_ioctl_setconf(struct file *file, unsigned long data)
chan->_confn = dahdi_get_conf_alias(conf.confno);
}
spin_unlock(&chan->lock);
if (conf_chan) {
if ((confmode == DAHDI_CONF_MONITOR_RX_PREECHO) ||
(confmode == DAHDI_CONF_MONITOR_TX_PREECHO) ||
(confmode == DAHDI_CONF_MONITORBOTH_PREECHO)) {
void *temp = kmalloc(sizeof(*chan->readchunkpreec) *
if (!conf_chan->readchunkpreec) {
void *temp = kmalloc(sizeof(short) *
DAHDI_CHUNKSIZE, GFP_ATOMIC);
if (temp) {
preec = ENABLE_HWPREEC;
spin_lock(&conf_chan->lock);
conf_chan->readchunkpreec = temp;
spin_unlock(&conf_chan->lock);
}
}
} else {
preec = DISABLE_HWPREEC;
spin_lock(&conf_chan->lock);
kfree(conf_chan->readchunkpreec);
conf_chan->readchunkpreec = NULL;
spin_unlock(&conf_chan->lock);
}
}
spin_unlock(&chan->lock);
spin_unlock_irqrestore(&chan_lock, flags);
if (ENABLE_HWPREEC == preec) {
int res = dahdi_enable_hw_preechocan(conf_chan);
if (res) {
spin_lock_irqsave(&chan_lock, flags);
spin_lock(&conf_chan->lock);
kfree(conf_chan->readchunkpreec);
conf_chan->readchunkpreec = NULL;
spin_unlock(&conf_chan->lock);
spin_unlock_irqrestore(&chan_lock, flags);
}
return res;
} else if (DISABLE_HWPREEC == preec) {
dahdi_disable_hw_preechocan(conf_chan);
}
dahdi_check_conf(oldconf);
if (copy_to_user((void __user *)data, &conf, sizeof(conf)))
return -EFAULT;
@ -6497,6 +6616,13 @@ static int _dahdi_register(struct dahdi_span *span, int prefmaster)
if (!span || !span->ops || !span->ops->owner)
return -EINVAL;
if (span->ops->enable_hw_preechocan ||
span->ops->disable_hw_preechocan) {
if ((NULL == span->ops->enable_hw_preechocan) ||
(NULL == span->ops->disable_hw_preechocan))
return -EINVAL;
}
if (!span->deflaw) {
module_printk(KERN_NOTICE, "Span %s didn't specify default law. "
"Assuming mulaw, please fix driver!\n", span->name);
@ -7750,6 +7876,8 @@ void __dahdi_ec_chunk(struct dahdi_chan *ss, u8 *rxchunk,
short rxlin;
int x;
spin_lock(&ss->lock);
if (ss->readchunkpreec) {
/* Save a copy of the audio before the echo can has its way with it */
for (x = 0; x < DAHDI_CHUNKSIZE; x++)
@ -7811,6 +7939,8 @@ void __dahdi_ec_chunk(struct dahdi_chan *ss, u8 *rxchunk,
dahdi_kernel_fpu_end();
#endif
}
spin_unlock(&ss->lock);
}
EXPORT_SYMBOL(__dahdi_ec_chunk);
@ -7829,10 +7959,7 @@ void _dahdi_ec_span(struct dahdi_span *span)
struct dahdi_chan *const chan = span->chans[x];
if (!chan->ec_current)
continue;
spin_lock(&chan->lock);
_dahdi_ec_chunk(chan, chan->readchunk, chan->writechunk);
spin_unlock(&chan->lock);
}
}
EXPORT_SYMBOL(_dahdi_ec_span);
@ -9372,31 +9499,6 @@ static void __exit watchdog_cleanup(void)
#endif
static const char *hwec_def_name = "HWEC";
static const char *hwec_get_name(const struct dahdi_chan *chan)
{
if (chan && chan->span && chan->span->ops->echocan_name)
return chan->span->ops->echocan_name(chan);
else
return hwec_def_name;
}
static int hwec_echocan_create(struct dahdi_chan *chan,
struct dahdi_echocanparams *ecp, struct dahdi_echocanparam *p,
struct dahdi_echocan_state **ec)
{
if (chan->span && chan->span->ops->echocan_create)
return chan->span->ops->echocan_create(chan, ecp, p, ec);
else
return -ENODEV;
}
static const struct dahdi_echocan_factory hwec_factory = {
.get_name = hwec_get_name,
.owner = THIS_MODULE,
.echocan_create = hwec_echocan_create,
};
static int __init dahdi_init(void)
{
int res = 0;

6
include/dahdi/kernel.h
View File

@ -864,6 +864,12 @@ struct dahdi_span_ops {
int (*audio_notify)(struct dahdi_chan *chan, int yes);
#endif
/*! Opt: Enable preechocan stream from inline HW echocanceler. */
int (*enable_hw_preechocan)(struct dahdi_chan *chan);
/*! Opt: Disable preechocan stream from inline HW echocanceler. */
void (*disable_hw_preechocan)(struct dahdi_chan *chan);
/*! Opt: Dacs the contents of chan2 into chan1 if possible */
int (*dacs)(struct dahdi_chan *chan1, struct dahdi_chan *chan2);