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1231 lines
33 KiB
1231 lines
33 KiB
/* |
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* Author Andreas Eversberg ([email protected]) |
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* Based on source code structure by |
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* Karsten Keil ([email protected]) |
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* |
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* This file is (c) under GNU PUBLIC LICENSE |
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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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|
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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 switched 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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|
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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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|
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static const char *mISDN_dsp_revision = "2.0"; |
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|
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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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|
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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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|
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/*int spinnest = 0;*/ |
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|
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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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|
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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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|
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memset(&cq, 0, sizeof(cq)); |
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|
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if (!dsp->features_rx_off) |
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return; |
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|
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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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|
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if (rx_off == dsp->rx_is_off) |
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return; |
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|
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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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|
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if (dsp_options & DSP_OPT_NOHARDWARE) |
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return; |
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|
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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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|
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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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|
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memset(&cq, 0, sizeof(cq)); |
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|
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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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|
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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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|
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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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return -EINVAL; |
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} |
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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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|
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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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|
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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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} |
|
if (dsp_debug & DEBUG_DSP_CORE) |
|
printk(KERN_DEBUG "%s: enable mixing of " |
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"tx-data with conf members\n", __func__); |
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dsp->tx_mix = 1; |
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dsp_cmx_hardware(dsp->conf, dsp); |
|
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) |
|
printk(KERN_DEBUG "%s: disable mixing of " |
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"tx-data with conf members\n", __func__); |
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dsp->tx_mix = 0; |
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dsp_cmx_hardware(dsp->conf, dsp); |
|
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; |
|
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); |
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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); |
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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 */ |
|
timer_setup(&ndsp->tone.tl, dsp_tone_timeout, 0); |
|
|
|
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 */ |
|
timer_setup(&dsp_spl_tl, (void *)dsp_cmx_send, 0); |
|
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);
|
|
|