1 // SPDX-License-Identifier: GPL-2.0-or-later
9 #include "cx88-reg.h"
77 		return -int_cos(x - INT_PI);  in int_cos()
80 		return -int_cos(INT_PI / 2 - (x % (INT_PI / 2)));  in int_cos()
82 	 * Now x is between 0 and INT_PI/2.  in int_cos()
89 	ret = 32768 - t2 + t4 - t6 + t8;  in int_cos()
108 		s32 s = x[i] + ((s64)coeff * s_prev / 32768) - s_prev2;  in int_goertzel()
114 	tmp = (s64)s_prev2 * s_prev2 + (s64)s_prev * s_prev -  in int_goertzel()
143 		x += (N - 192);  in noise_magnitude()
147 	freq_step = (freq_end - freq_start) / (samples - 1);  in noise_magnitude()
159 	s32 carrier, stereo, dual, noise;  in detect_a2_a2m_eiaj()  local
163 	switch (core->tvaudio) {  in detect_a2_a2m_eiaj()
182 			core->tvaudio, __func__);  in detect_a2_a2m_eiaj()
188 	dual    = freq_magnitude(x, N, dual_freq);  in detect_a2_a2m_eiaj()
192 		"detect a2/a2m/eiaj: carrier=%d, stereo=%d, dual=%d, noise=%d\n",  in detect_a2_a2m_eiaj()
193 		carrier, stereo, dual, noise);  in detect_a2_a2m_eiaj()
195 	if (stereo > dual)  in detect_a2_a2m_eiaj()
200 	if (core->tvaudio == WW_EIAJ) {  in detect_a2_a2m_eiaj()
202 		if ((carrier > max(stereo, dual) * 2) &&  in detect_a2_a2m_eiaj()
203 		    (carrier < max(stereo, dual) * 6) &&  in detect_a2_a2m_eiaj()
205 		    (max(stereo, dual) > min(stereo, dual))) {  in detect_a2_a2m_eiaj()
207 			 * For EIAJ the carrier is always present,  in detect_a2_a2m_eiaj()
213 		if ((carrier > max(stereo, dual) * 2) &&  in detect_a2_a2m_eiaj()
214 		    (carrier < max(stereo, dual) * 8) &&  in detect_a2_a2m_eiaj()
217 		    (max(stereo, dual) > min(stereo, dual) * 2)) {  in detect_a2_a2m_eiaj()
229 	s32 dual = freq_magnitude(x, N, FREQ_BTSC_DUAL);  in detect_btsc()  local
231 	dprintk(1, "detect btsc: dual_ref=%d, dual=%d, sap_ref=%d, sap=%d\n",  in detect_btsc()
232 		dual_ref, dual, sap_ref, sap);  in detect_btsc()
243 	unsigned int bpl = srch->fifo_size / AUD_RDS_LINES;  in read_rds_samples()
245 	unsigned int sample_count = spl * (AUD_RDS_LINES - 1);  in read_rds_samples()
247 	u32 current_address = cx_read(srch->ptr1_reg);  in read_rds_samples()
248 	u32 offset = (current_address - srch->fifo_start + bpl);  in read_rds_samples()
253 		current_address - srch->fifo_start, sample_count,  in read_rds_samples()
263 		samples[i] = cx_read(srch->fifo_start + offset);  in read_rds_samples()
278 	/* If audio RDS fifo is disabled, we can't read the samples */  in cx88_dsp_detect_stereo_sap()
285 	if (time_before(jiffies, core->last_change + msecs_to_jiffies(500)))  in cx88_dsp_detect_stereo_sap()
293 	switch (core->tvaudio) {  in cx88_dsp_detect_stereo_sap()
318 			(ret & V4L2_TUNER_SUB_LANG2) ? " dual" : "");  in cx88_dsp_detect_stereo_sap()