![Karsten Keil](/assets/img/avatar_default.png)
MISDN_CTRL_FILL_EMPTY is a meachanism to send a fixed value (normally silence) as long no data from upper layers is available. It can be used when recording voice messages or with unidirectional protocols. Signed-off-by: Karsten Keil <kkeil@linux-pingi.de> Signed-off-by: David S. Miller <davem@davemloft.net>
1237 lines
33 KiB
C
1237 lines
33 KiB
C
/*
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* Author Andreas Eversberg (jolly@eversberg.eu)
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* Based on source code structure by
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* Karsten Keil (keil@isdn4linux.de)
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*
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* This file is (c) under GNU PUBLIC LICENSE
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* For changes and modifications please read
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* ../../../Documentation/isdn/mISDN.cert
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*
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* Thanks to Karsten Keil (great drivers)
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* Cologne Chip (great chips)
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*
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* This module does:
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* Real-time tone generation
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* DTMF detection
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* Real-time cross-connection and conferrence
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* Compensate jitter due to system load and hardware fault.
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* All features are done in kernel space and will be realized
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* using hardware, if available and supported by chip set.
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* Blowfish encryption/decryption
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*/
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/* STRUCTURE:
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*
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* The dsp module provides layer 2 for b-channels (64kbit). It provides
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* transparent audio forwarding with special digital signal processing:
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*
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* - (1) generation of tones
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* - (2) detection of dtmf tones
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* - (3) crossconnecting and conferences (clocking)
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* - (4) echo generation for delay test
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* - (5) volume control
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* - (6) disable receive data
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* - (7) pipeline
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* - (8) encryption/decryption
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*
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* Look:
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* TX RX
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* ------upper layer------
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* | ^
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* | |(6)
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* v |
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* +-----+-------------+-----+
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* |(3)(4) |
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* | CMX |
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* | |
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* | +-------------+
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* | | ^
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* | | |
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* |+---------+| +----+----+
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* ||(1) || |(2) |
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* || || | |
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* || Tones || | DTMF |
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* || || | |
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* || || | |
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* |+----+----+| +----+----+
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* +-----+-----+ ^
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* | |
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* v |
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* +----+----+ +----+----+
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* |(5) | |(5) |
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* | | | |
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* |TX Volume| |RX Volume|
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* | | | |
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* | | | |
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* +----+----+ +----+----+
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* | ^
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* | |
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* v |
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* +----+-------------+----+
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* |(7) |
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* | |
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* | Pipeline Processing |
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* | |
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* | |
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* +----+-------------+----+
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* | ^
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* | |
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* v |
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* +----+----+ +----+----+
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* |(8) | |(8) |
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* | | | |
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* | Encrypt | | Decrypt |
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* | | | |
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* | | | |
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* +----+----+ +----+----+
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* | ^
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* | |
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* v |
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* ------card layer------
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* TX RX
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*
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* Above you can see the logical data flow. If software is used to do the
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* process, it is actually the real data flow. If hardware is used, data
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* may not flow, but hardware commands to the card, to provide the data flow
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* as shown.
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*
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* NOTE: The channel must be activated in order to make dsp work, even if
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* no data flow to the upper layer is intended. Activation can be done
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* after and before controlling the setting using PH_CONTROL requests.
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*
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* DTMF: Will be detected by hardware if possible. It is done before CMX
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* processing.
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*
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* Tones: Will be generated via software if endless looped audio fifos are
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* not supported by hardware. Tones will override all data from CMX.
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* It is not required to join a conference to use tones at any time.
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*
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* CMX: Is transparent when not used. When it is used, it will do
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* crossconnections and conferences via software if not possible through
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* hardware. If hardware capability is available, hardware is used.
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*
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* Echo: Is generated by CMX and is used to check performance of hard and
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* software CMX.
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*
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* The CMX has special functions for conferences with one, two and more
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* members. It will allow different types of data flow. Receive and transmit
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* data to/form upper layer may be swithed on/off individually without losing
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* features of CMX, Tones and DTMF.
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*
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* Echo Cancellation: Sometimes we like to cancel echo from the interface.
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* Note that a VoIP call may not have echo caused by the IP phone. The echo
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* is generated by the telephone line connected to it. Because the delay
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* is high, it becomes an echo. RESULT: Echo Cachelation is required if
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* both echo AND delay is applied to an interface.
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* Remember that software CMX always generates a more or less delay.
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*
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* If all used features can be realized in hardware, and if transmit and/or
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* receive data ist disabled, the card may not send/receive any data at all.
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* Not receiving is useful if only announcements are played. Not sending is
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* useful if an answering machine records audio. Not sending and receiving is
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* useful during most states of the call. If supported by hardware, tones
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* will be played without cpu load. Small PBXs and NT-Mode applications will
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* not need expensive hardware when processing calls.
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*
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*
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* LOCKING:
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*
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* When data is received from upper or lower layer (card), the complete dsp
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* module is locked by a global lock. This lock MUST lock irq, because it
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* must lock timer events by DSP poll timer.
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* When data is ready to be transmitted down, the data is queued and sent
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* outside lock and timer event.
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* PH_CONTROL must not change any settings, join or split conference members
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* during process of data.
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*
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* HDLC:
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*
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* It works quite the same as transparent, except that HDLC data is forwarded
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* to all other conference members if no hardware bridging is possible.
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* Send data will be writte to sendq. Sendq will be sent if confirm is received.
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* Conference cannot join, if one member is not hdlc.
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*
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*/
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#include <linux/delay.h>
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#include <linux/gfp.h>
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#include <linux/mISDNif.h>
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#include <linux/mISDNdsp.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include "core.h"
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#include "dsp.h"
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static const char *mISDN_dsp_revision = "2.0";
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static int debug;
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static int options;
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static int poll;
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static int dtmfthreshold = 100;
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MODULE_AUTHOR("Andreas Eversberg");
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module_param(debug, uint, S_IRUGO | S_IWUSR);
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module_param(options, uint, S_IRUGO | S_IWUSR);
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module_param(poll, uint, S_IRUGO | S_IWUSR);
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module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
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MODULE_LICENSE("GPL");
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/*int spinnest = 0;*/
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spinlock_t dsp_lock; /* global dsp lock */
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struct list_head dsp_ilist;
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struct list_head conf_ilist;
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int dsp_debug;
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int dsp_options;
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int dsp_poll, dsp_tics;
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/* check if rx may be turned off or must be turned on */
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static void
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dsp_rx_off_member(struct dsp *dsp)
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{
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struct mISDN_ctrl_req cq;
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int rx_off = 1;
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memset(&cq, 0, sizeof(cq));
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if (!dsp->features_rx_off)
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return;
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/* not disabled */
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if (!dsp->rx_disabled)
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rx_off = 0;
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/* software dtmf */
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else if (dsp->dtmf.software)
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rx_off = 0;
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/* echo in software */
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else if (dsp->echo.software)
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rx_off = 0;
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/* bridge in software */
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else if (dsp->conf && dsp->conf->software)
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rx_off = 0;
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/* data is not required by user space and not required
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* for echo dtmf detection, soft-echo, soft-bridging */
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if (rx_off == dsp->rx_is_off)
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return;
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if (!dsp->ch.peer) {
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: no peer, no rx_off\n",
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__func__);
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return;
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}
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cq.op = MISDN_CTRL_RX_OFF;
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cq.p1 = rx_off;
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if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
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printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
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__func__);
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return;
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}
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dsp->rx_is_off = rx_off;
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
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__func__, dsp->name, rx_off);
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}
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static void
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dsp_rx_off(struct dsp *dsp)
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{
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struct dsp_conf_member *member;
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if (dsp_options & DSP_OPT_NOHARDWARE)
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return;
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/* no conf */
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if (!dsp->conf) {
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dsp_rx_off_member(dsp);
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return;
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}
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/* check all members in conf */
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list_for_each_entry(member, &dsp->conf->mlist, list) {
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dsp_rx_off_member(member->dsp);
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}
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}
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/* enable "fill empty" feature */
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static void
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dsp_fill_empty(struct dsp *dsp)
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{
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struct mISDN_ctrl_req cq;
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memset(&cq, 0, sizeof(cq));
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if (!dsp->ch.peer) {
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
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__func__);
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return;
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}
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cq.op = MISDN_CTRL_FILL_EMPTY;
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cq.p1 = 1;
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cq.p2 = dsp_silence;
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if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
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printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
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__func__);
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return;
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}
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
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__func__, dsp->name);
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}
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static int
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dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
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{
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struct sk_buff *nskb;
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int ret = 0;
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int cont;
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u8 *data;
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int len;
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if (skb->len < sizeof(int))
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printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
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cont = *((int *)skb->data);
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len = skb->len - sizeof(int);
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data = skb->data + sizeof(int);
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switch (cont) {
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case DTMF_TONE_START: /* turn on DTMF */
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if (dsp->hdlc) {
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ret = -EINVAL;
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break;
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}
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: start dtmf\n", __func__);
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if (len == sizeof(int)) {
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_NOTICE "changing DTMF Threshold "
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"to %d\n", *((int *)data));
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dsp->dtmf.treshold = (*(int *)data) * 10000;
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}
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dsp->dtmf.enable = 1;
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/* init goertzel */
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dsp_dtmf_goertzel_init(dsp);
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/* check dtmf hardware */
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dsp_dtmf_hardware(dsp);
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dsp_rx_off(dsp);
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break;
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case DTMF_TONE_STOP: /* turn off DTMF */
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
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dsp->dtmf.enable = 0;
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dsp->dtmf.hardware = 0;
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dsp->dtmf.software = 0;
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break;
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case DSP_CONF_JOIN: /* join / update conference */
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if (len < sizeof(int)) {
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ret = -EINVAL;
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break;
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}
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if (*((u32 *)data) == 0)
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goto conf_split;
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: join conference %d\n",
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__func__, *((u32 *)data));
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ret = dsp_cmx_conf(dsp, *((u32 *)data));
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/* dsp_cmx_hardware will also be called here */
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dsp_rx_off(dsp);
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if (dsp_debug & DEBUG_DSP_CMX)
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dsp_cmx_debug(dsp);
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break;
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case DSP_CONF_SPLIT: /* remove from conference */
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conf_split:
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: release conference\n", __func__);
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ret = dsp_cmx_conf(dsp, 0);
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/* dsp_cmx_hardware will also be called here */
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if (dsp_debug & DEBUG_DSP_CMX)
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dsp_cmx_debug(dsp);
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dsp_rx_off(dsp);
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break;
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case DSP_TONE_PATT_ON: /* play tone */
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if (dsp->hdlc) {
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ret = -EINVAL;
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break;
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}
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if (len < sizeof(int)) {
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ret = -EINVAL;
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break;
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}
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
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__func__, *((int *)skb->data));
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ret = dsp_tone(dsp, *((int *)data));
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if (!ret) {
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_rx_off(dsp);
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}
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if (!dsp->tone.tone)
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goto tone_off;
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break;
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case DSP_TONE_PATT_OFF: /* stop tone */
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if (dsp->hdlc) {
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ret = -EINVAL;
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break;
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}
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: turn tone off\n", __func__);
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dsp_tone(dsp, 0);
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_rx_off(dsp);
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/* reset tx buffers (user space data) */
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tone_off:
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dsp->rx_W = 0;
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dsp->rx_R = 0;
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break;
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case DSP_VOL_CHANGE_TX: /* change volume */
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if (dsp->hdlc) {
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ret = -EINVAL;
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break;
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}
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if (len < sizeof(int)) {
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ret = -EINVAL;
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break;
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}
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dsp->tx_volume = *((int *)data);
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: change tx vol to %d\n",
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__func__, dsp->tx_volume);
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_dtmf_hardware(dsp);
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dsp_rx_off(dsp);
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break;
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case DSP_VOL_CHANGE_RX: /* change volume */
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if (dsp->hdlc) {
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ret = -EINVAL;
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break;
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}
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if (len < sizeof(int)) {
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ret = -EINVAL;
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break;
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}
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dsp->rx_volume = *((int *)data);
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: change rx vol to %d\n",
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__func__, dsp->tx_volume);
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_dtmf_hardware(dsp);
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dsp_rx_off(dsp);
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break;
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case DSP_ECHO_ON: /* enable echo */
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dsp->echo.software = 1; /* soft echo */
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_rx_off(dsp);
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if (dsp_debug & DEBUG_DSP_CMX)
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dsp_cmx_debug(dsp);
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break;
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case DSP_ECHO_OFF: /* disable echo */
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dsp->echo.software = 0;
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dsp->echo.hardware = 0;
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_rx_off(dsp);
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if (dsp_debug & DEBUG_DSP_CMX)
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dsp_cmx_debug(dsp);
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break;
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case DSP_RECEIVE_ON: /* enable receive to user space */
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: enable receive to user "
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"space\n", __func__);
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dsp->rx_disabled = 0;
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dsp_rx_off(dsp);
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break;
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case DSP_RECEIVE_OFF: /* disable receive to user space */
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: disable receive to "
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"user space\n", __func__);
|
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dsp->rx_disabled = 1;
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dsp_rx_off(dsp);
|
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break;
|
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case DSP_MIX_ON: /* enable mixing of tx data */
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if (dsp->hdlc) {
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ret = -EINVAL;
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break;
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}
|
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if (dsp_debug & DEBUG_DSP_CORE)
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printk(KERN_DEBUG "%s: enable mixing of "
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"tx-data with conf mebers\n", __func__);
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dsp->tx_mix = 1;
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dsp_cmx_hardware(dsp->conf, dsp);
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dsp_rx_off(dsp);
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if (dsp_debug & DEBUG_DSP_CMX)
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dsp_cmx_debug(dsp);
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break;
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case DSP_MIX_OFF: /* disable mixing of tx data */
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if (dsp->hdlc) {
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ret = -EINVAL;
|
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break;
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}
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if (dsp_debug & DEBUG_DSP_CORE)
|
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printk(KERN_DEBUG "%s: disable mixing of "
|
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"tx-data with conf mebers\n", __func__);
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dsp->tx_mix = 0;
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dsp_cmx_hardware(dsp->conf, dsp);
|
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dsp_rx_off(dsp);
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if (dsp_debug & DEBUG_DSP_CMX)
|
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dsp_cmx_debug(dsp);
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break;
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|
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);
|
|
|
|
if (timer_pending(&dsp_spl_tl))
|
|
del_timer(&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);
|