Add mISDN DSP

Enable support for digital audio processing capability.
This module may be used for special applications that require
cross connecting of bchannels, conferencing, dtmf decoding
echo cancelation, tone generation, and Blowfish encryption and
decryption.
It may use hardware features if available.

Signed-off-by: Karsten Keil <kkeil@suse.de>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/linux/mISDNdsp.h b/include/linux/mISDNdsp.h
new file mode 100644
index 000000000000..6b71d2dce508
--- /dev/null
+++ b/include/linux/mISDNdsp.h
@@ -0,0 +1,37 @@
+#ifndef __mISDNdsp_H__
+#define __mISDNdsp_H__
+
+struct mISDN_dsp_element_arg {
+        char    *name;
+        char    *def;
+        char    *desc;
+};
+
+struct mISDN_dsp_element {
+        char    *name;
+        void    *(*new)(const char *arg);
+        void    (*free)(void *p);
+        void    (*process_tx)(void *p, unsigned char *data, int len);
+        void    (*process_rx)(void *p, unsigned char *data, int len);
+        int     num_args;
+        struct mISDN_dsp_element_arg
+                *args;
+};
+
+extern int  mISDN_dsp_element_register(struct mISDN_dsp_element *elem);
+extern void mISDN_dsp_element_unregister(struct mISDN_dsp_element *elem);
+
+struct dsp_features {
+        int     hfc_id; /* unique id to identify the chip (or -1) */
+        int     hfc_dtmf; /* set if HFCmulti card supports dtmf */
+        int     hfc_loops; /* set if card supports tone loops */
+        int     hfc_echocanhw; /* set if card supports echocancelation*/
+        int     pcm_id; /* unique id to identify the pcm bus (or -1) */
+        int     pcm_slots; /* number of slots on the pcm bus */
+        int     pcm_banks; /* number of IO banks of pcm bus */
+        int     unclocked; /* data is not clocked (has jitter/loss) */
+        int     unordered; /* data is unordered (packets have index) */
+};
+
+#endif
+