24 	/* k << 15 (source: hfc-4s/8s documentation (www.colognechip.de)) */
31 	{'1', '2', '3', 'A'},
34 	{'*', '0', '#', 'D'}
42 	dsp->dtmf.size = 0;  in dsp_dtmf_goertzel_init()
43 	dsp->dtmf.lastwhat = '\0';  in dsp_dtmf_goertzel_init()
44 	dsp->dtmf.lastdigit = '\0';  in dsp_dtmf_goertzel_init()
45 	dsp->dtmf.count = 0;  in dsp_dtmf_goertzel_init()
54 	if (!dsp->dtmf.enable)  in dsp_dtmf_hardware()
57 	if (!dsp->features.hfc_dtmf)  in dsp_dtmf_hardware()
61 	if (dsp->tx_volume) {  in dsp_dtmf_hardware()
65 			       __func__, dsp->name);  in dsp_dtmf_hardware()
68 	if (dsp->rx_volume) {  in dsp_dtmf_hardware()
72 			       __func__, dsp->name);  in dsp_dtmf_hardware()
76 	if (dsp->bf_enable) {  in dsp_dtmf_hardware()
80 			       __func__, dsp->name);  in dsp_dtmf_hardware()
84 	if (dsp->pipeline.inuse) {  in dsp_dtmf_hardware()
88 			       __func__, dsp->name);  in dsp_dtmf_hardware()
92 	dsp->dtmf.hardware = hardware;  in dsp_dtmf_hardware()
93 	dsp->dtmf.software = !hardware;  in dsp_dtmf_hardware()
112  * dtmf - points to a structure of the current dtmf state
113  * spl and len - the sample
114  * fmt - 0 = alaw, 1 = ulaw, 2 = coefficients from HFC DTMF hw-decoder
130 	dsp->dtmf.digits[0] = '\0';  in dsp_dtmf_goertzel_decode()
137 	size = dsp->dtmf.size;  in dsp_dtmf_goertzel_decode()
138 	buf = dsp->dtmf.buffer;  in dsp_dtmf_goertzel_decode()
144 			len--;  in dsp_dtmf_goertzel_decode()
153 				       "size. (is=%d < must=%d)\n",  in dsp_dtmf_goertzel_decode()
155 			return dsp->dtmf.digits;  in dsp_dtmf_goertzel_decode()
161 			if (sk > 32767 || sk < -32767 || sk2 > 32767  in dsp_dtmf_goertzel_decode()
162 			    || sk2 < -32767)  in dsp_dtmf_goertzel_decode()
164 				       "DTMF-Detection overflow\n");  in dsp_dtmf_goertzel_decode()
167 				(sk * sk) -  in dsp_dtmf_goertzel_decode()
172 		len -= 64;  in dsp_dtmf_goertzel_decode()
176 	dsp->dtmf.size = size;  in dsp_dtmf_goertzel_decode()
179 		return dsp->dtmf.digits;  in dsp_dtmf_goertzel_decode()
181 	dsp->dtmf.size = 0;  in dsp_dtmf_goertzel_decode()
183 	/* now we have a full buffer of signed long samples - we do goertzel */  in dsp_dtmf_goertzel_decode()
188 		buf = dsp->dtmf.buffer;  in dsp_dtmf_goertzel_decode()
191 			sk = ((cos2pik_ * sk1) >> 15) - sk2 + (*buf++);  in dsp_dtmf_goertzel_decode()
197 		if (sk > 32767 || sk < -32767 || sk2 > 32767 || sk2 < -32767)  in dsp_dtmf_goertzel_decode()
198 			printk(KERN_WARNING "DTMF-Detection overflow\n");  in dsp_dtmf_goertzel_decode()
201 			(sk * sk) -  in dsp_dtmf_goertzel_decode()
214 		if (result[i] > dsp->dtmf.treshold) {  in dsp_dtmf_goertzel_decode()
231 				"tresh(%d) too small set tresh/100 to 1\n",  in dsp_dtmf_goertzel_decode()
234 		printk(KERN_DEBUG "a %3d %3d %3d %3d %3d %3d %3d %3d"  in dsp_dtmf_goertzel_decode()
235 		       " tr:%3d r %3d %3d %3d %3d %3d %3d %3d %3d\n",  in dsp_dtmf_goertzel_decode()
237 		       result[3] / 10000, result[4] / 10000, result[5] / 10000,  in dsp_dtmf_goertzel_decode()
240 		       result[2] / (tresh_100), result[3] / (tresh_100),  in dsp_dtmf_goertzel_decode()
246 	lowgroup = -1;  in dsp_dtmf_goertzel_decode()
247 	highgroup = -1;  in dsp_dtmf_goertzel_decode()
248 	treshl = tresh >> 3;  /* tones which are not on, must be below 9 dB */  in dsp_dtmf_goertzel_decode()
254 			lowgroup = -1;  in dsp_dtmf_goertzel_decode()
255 			highgroup = -1;  in dsp_dtmf_goertzel_decode()
263 				lowgroup = -1;  in dsp_dtmf_goertzel_decode()
271 				highgroup = -1;  in dsp_dtmf_goertzel_decode()
274 				highgroup = i - (NCOEFF / 2);  in dsp_dtmf_goertzel_decode()
287 	if (dsp->dtmf.lastwhat != what)  in dsp_dtmf_goertzel_decode()
288 		dsp->dtmf.count = 0;  in dsp_dtmf_goertzel_decode()
290 	/* the tone (or no tone) must remain 3 times without change */  in dsp_dtmf_goertzel_decode()
291 	if (dsp->dtmf.count == 2) {  in dsp_dtmf_goertzel_decode()
292 		if (dsp->dtmf.lastdigit != what) {  in dsp_dtmf_goertzel_decode()
293 			dsp->dtmf.lastdigit = what;  in dsp_dtmf_goertzel_decode()
298 				if ((strlen(dsp->dtmf.digits) + 1)  in dsp_dtmf_goertzel_decode()
299 				    < sizeof(dsp->dtmf.digits)) {  in dsp_dtmf_goertzel_decode()
300 					dsp->dtmf.digits[strlen(  in dsp_dtmf_goertzel_decode()
301 							dsp->dtmf.digits) + 1] = '\0';  in dsp_dtmf_goertzel_decode()
302 					dsp->dtmf.digits[strlen(  in dsp_dtmf_goertzel_decode()
303 							dsp->dtmf.digits)] = what;  in dsp_dtmf_goertzel_decode()
308 		dsp->dtmf.count++;  in dsp_dtmf_goertzel_decode()
310 	dsp->dtmf.lastwhat = what;  in dsp_dtmf_goertzel_decode()